Diamond Machining Technology (DMT) W250CXNB DuoSharp Double-Sided Diamond Sharpening Stone, Coarse/Extra Coarse, 10 Inch

I researched quite a bit before buying a stone & a steel and I am glad I did. Oil Stones? forget em they are messy and not nearly as good as the Japanese water stones they wear down and they are slow. Have a hardness of around 6.5-7 on the Mohs scale and on good knives that have a Rockwell hardness 56-60 and up to 66 they just dont cut it. Water stones? these are good do a fine job, need to be soaked in water for a few mins, no mess but a good quality Japanese water stone will cost just as much if not more as this diamond stone and most are single grit, they also wear down rather quickly and become useless until you flatten them back out and what do you flatten them with? A big Diamond stone! or Aluminum oxide sand paper like maybe 120-220 grit glued to a piece of glass, which BTW makes a fairly decent sharpening stone on its own (in finer grits 800-2000) that are better than the oil stones. These are made of Aluminum Oxide in a resin bond, aluminum oxide has a hardness of 9.2 (Mohs) these work better on good knives. These also need to be dried before storing them or they will deteriorate much quicker. Ceramic Stones? These are good, dont need to be soaked and wont wear out as fast as regular water stones as they are in a "ceramic bond" instead of resin, these are either aluminum oxide or silicon carbide, the carbide is slightly harder at 9.5 These stones will still wear down just not as fast as the regular resin bond water stones. Both resin bond and ceramic water stones rarely if ever come larger than 8X3" (I have yet to see one, if they exist they would be even more expensive). This is the only non-diamond stone I would recommend and even then just for a super fine 5000-8000 grit to hone & polish the blade. Diamond stones? Well this is the only way to go as far as im concerned, no mess at all and if you use water on it the water fills in the pockets and the blade just glides over the stone and stays constantly lubed and cleaned. These stones cut faster than any other stone have a hardness of 10 (Mohs) and stay flat these are perfect for good steel knives especially the 60-66 (Rockwell) hardness. The 2 best features of these stones are they stay flat and they are 10X4" which you just cant beat, it gives you nice long easy strokes. Properly taken care of by the average home kitchen user just sharpening his/her small quiver of knives and in between using a fine steel this stone should last decades. Using a fine steel everytime you use your knife you should only need to use your stone just a few times a year. I would suggest this stone DMT 4"X10" Extra Fine & Fine with the Duobase holder which makes it easier to use, then a fine steel like the "F. Dick 11" Multicut Sharpening Steel" which I got here at Amazon also, using this steel makes a HUGE difference and keeps my knife razor sharp. If you want the perfect polished razor sharp edge also get a Global Ceramic Whetstone, Fine Grit (5000grit) then finish it off with a "Leather Strop" glued to a wooden paddle with a bit of very fine metal polish like white jewelers rouge or flitz and you will have a truly razor sharp and long lasting edge.

I have used various stones for sharpening knives for (too) many years. In fact, I have reviewed two of them here on Amazon.com. I stand by my positive reviews of the stones, but this 4x10 diamond stone takes it all to a new level. I wanted to try the latest in whetstones, and this one caught my eye because it is LARGE, and has two grits built in. It is also very expensive. That being said, using this tool will leave you speechless. It is that good. First of all, it is large enough to handle anything from a penknife to a 10" slicer with full coverage in a single stroke. Every whetstone should be this size. It is also thin, and isn't consumed during sharpening. The non slip pad provided with the stone works like a charm. Water is the only lubricant used, and cleanup is a snap. Don't be fooled by the "fine" and "extra fine" rating of it's surfaces. The fine side will fix a badly worn kitchen edge in a few strokes. My guess is that the knife will also be better than new when you are done. The extra fine side will turn good steel into a razor in just a few more strokes. After years of taking time and care to acheive a perfect edge with natural and man made stones, this was an epiphany. The job was so easy, and the results so fantastic, that I went on a sharpening binge and turned over 15 well used knives into razors in little more than 30 minutes. I also bought the Global sharpening guides for a couple of bucks. They are not needed for small knives, or for an experienced pro, but they make the fine edge look very uniform on longer blades. They give the "factory" look with the custom edge. This is an incredible tool. By the way, when you are done, you just rinse it and put it away. I doesn't get any better than this!

First of all, let me say I'm a small-time knifemaker. I've used about every system of sharpening around, the "paper" wheels, the Lansky system, etc. They all work, but they're a hassle and I've always been looking for something better. I've long thought about getting a DMT stone but haven't had the money. I finally picked up the 10" Duosharp fine/extra fine stone to give it a try. It's pretty much taken over all my sharpening needs these days. If a stone is reasonably sharp, not completely blunted or chipped, 5-10 strokes on the fine side followed by 10 or so on the extra fine put a good usable edge on a blade. Follow that with a little stropping and you're 99 percent sharp. For a working knife, it's all the edge you'll ever need. The size of the stone is great. I sharpen blades from 2" to 8" or so and it easily handles all of them. In addition, the size really seems to help with holding a constant angle, I've never been able to hand sharpen anywhere near as well as I can with this stone. Part of it is how fast it cuts, you don't have to hold the angle for 100 strokes, just 5 or 10, part of it is the size of the stone. Highly recommended if you're serious about sharpening. It's good to have a coarse stone around when you really need to reset an angle or clean up some chips, but this stone will move a lot of metal, don't be fooled by the "fine" description.

After 17 years my stone is still in good shape & sharpening steel. I used up the blades on a couple of Chicago cutlery knifes. I'm still enjoying the ample size of the stone. Don't screw yourself with a small stone, go big, it's worth it. I paid about $100 in 2008. Today it sells for $125? Considering inflation it's a better value today than17 years ago. Based on the fact it does a good job of sharpening and combined with the long durability this stone has earned 4 stars. I would buy it again. First off, the whetstone does a decent job of sharpening kitchen knifes. I purchased the 4" X 10" duo stone with one side being graded as a "fine" and the flip side of the stone graded as "very fine". The good news is the size. 4" X 10" is a decent size working surface. You can hone with long even strokes. The Bad news is the price. A hundred dollar sharpener it isn't. I dare say that if you can find a one of those rare old wet stones that are of comparible lenght and width, buy them. I could not beat the old wet stone with the diamond. Speed - well, MAYBE the diamond is a little faster. Not much if any, but perhaps it is a little quicker. But remember this, If I had to choose between a short & narrow diamond stone or a old fashioned Larger wet stone, the wet stone wins everytime. Long smooth strokes make for ultra fine, concisely sharp edges. Short strokes cant match it - in MY opinion. Bottom line: The size of the stone is it's best feather. You pay dearly for that size. Dont waste your money on a smaller size, it may be cheaper, but every single time you use it, you'll wish you had a larger stone.

I purchased this item to sharpen woodworking planes and chisels. Good quality item. Works just as advertised. The larger size allows me to use a Veritas roller jig to keep the blade angle steady (although the jig is not worth the money for other reasons). Water wash off and easy cleaning. The plastic base is worth the extra money IMHO, but the antistick plastic mat works pretty well. I also used the "scary sharp" system to put a razor sharp edge on the blades. This is a automotive sandpaper on flat plate glass. The DMT fine whetstone is about a 15 micron equivalent where the "sandpaper" goes down to 0.5 micron. The chisel edge shines like a mirror. My only disappointment was in flattening the backs of old chisels. A coarser grade of diamond is needed for this higher metal removal technique. I tried coarse grade sandpaper, but it wore out quickly. The finer sandpaper grades do not because they only recieve 5-10 strokes after the diamond stone. For knives and general sharpening utensils, this diamond plate is great. For woodworking, I would buy the coarse / x-fine combination whetstone. Use the coarse side for the one time flattening and the fine or x-fine side for the intermediate surface grinding. Keep one 9"x12" glass plate of really fine micron sandpaper for the final polish.

I have had a 8"x 2 5/8" DMT diamond plate in fine/extra fine grits and I really like using it to sharpen my woodworking tools, however, I needed a coarser grit to sharpen a damaged plane blade. I happened onto this 10"x4" DMT plate at a very good price at the Amazon Warehouse. I figured there wasn't much risk in a used diamond plate, since it is nearly indestructible. A bonus was that it came with a base. I love the 10" plate, where you can take a longer sharpening stroke which speeds up sharpening. It cuts aggressively and evenly. Diamond plates are also good for flattening waterstones and the 10" size is a bonus for that task.

I ordered this expecting the best of the best in this category. It's an OK stone but it is not better than the Ultra Sharp II set I already had. The most disappointing part was that I ordered a double sided stone in Fine and Extra Fine and you cannot tell by looking which side is which. There are little colored dots on the plastic that the stone is adhered to that are supposed to let you know which grit is which but on mine there was only one dot rolling around loose in the box. I sent it back to get one that had both dots installed so I would know which side was which. They sent a new stone which also had only one dot rolling around loose in the box. BUT it was the "other color" from the first stone so I kept it and ran some bare metal over each side, inspected the marks that each side of the stone made and installed the colored dots accordingly. Not really sure I should have to do that on such an expensive stone. But it does work as well as my Ultra Sharp II stones and it is bigger so I guess it's OK. But next time I'll buy bigger Ultra Sharp II stones. They don't have plastic dots.. just nice big letters stamped into steel.

This is a general review for all 3 of the DMT 10-inch DuoSharp stones that I purchased. (I didn't want to write three separate reviews) These are the most excellent knife sharpening stones I have ever used. For the Coarse/Extra Coarse they cut through metal quickly and with very little pressure. Can profile a butter knife in less than 5 minutes. For the Fine/Extra Fine it is no problem to polish the edge to razor sharp. Again, very little effort. As to durability, well lets just say I have sharpened over 100 knifes, including an axe, a small sword, and a few exotic/specialty knifes and I don't see any signs of wear at all. I bought the black plastic holder for each stone (3) to minimize the risk of dropping/breaking the stones. For some of the larger knifes it is actually easier to clamp the knife/sword/axe down and hold the DMT stone and holder in the hand. I follow up with a leather strop for final polish, and the edges are hair popping sharp.

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Jag är nöjd med denna slipsten, den är stor och ordentlig. Jag använder den till mina slöjdverktyg och köksknivar med bra resultat. Ska tillägga att detta var den andra stenen jag fick för den första var defekt med "blåsor" i ytskiktet så det trillade av när jag använde den. Men denna är som den ska.

Great product. Its main use is to flatten my waterstones which I still use to sharpen plane blades instead of using my electric sharpeners. Sometimes the manual way is the best way. This two sided diamond bench stone has a large surface area making it easy to use on the waterstones. Cleans off easily. Stores snuggly taking up little space. You can use it to sharpen tool blades that are nicked and worn, too, but I prefer to save this for the flattening jobs.

Getting to like it more over time. Previous stones blistered and shed their nickel matix in places leaving holes which led to blades catching and ripping even more out. So far this seems to be an improvement. Price is certainly more competitive than prevously.

Great product, will last a lifetime.