Step Drill Bit Set, 3 Pieces Titanium Coated High Speed Steel Unibit Cone Drill Bit Kit for Plastic, Wood, Metal Sheet, Aluminum Hole Drilling HSS Stepped Driil Bit (Metric 4-12mm/4-20mm/4-32mm)

great product

These are great. I use them to drill holes in RC body shells. Has a nice clean hole.

Haven't had a chance for thorough testing in multiple materials, but the edges on these bits seem like they'll probably do okay in wood and plastic... metal might be iffy. The included pouch, while a nice touch, came with inadequate hook & loop to hold the pouch flap closed and secure the bits. And what little hook & loop was there wasn't fully attached. Therefore one of my brand new bits fell onto the tile floor (not good for my bit or my tile).

I used this to drill a hole so that I can install a momentary switch for the high idle on my 2022 F350 diesel.

Can’t believe I waited my whole life to get theses things, finally. Sheesh. I also can’t know how these measure up to competing versions but the ones I got worked brilliantly to make perfect circle 9/16 to 3/4 holes in my Pelican cases (for making DIY solar battery banks). I don’t know my method was necessary or just my OCD, but to be safe, I used my own 1/16 (tiny) drill bit to start the hole (for precision centering) and then worked up to a 5/64 (or something like a 7/64) before moving up to these drill bits. From there I just stepped my way up, going from the smallest bit, skipping over the skinny - tall bit, and then going to the widest bit to eventually make 3/4 holes. I also like that this kind of bit creates debris that is easy to clean up (long curly pieces of plastic). Pictured is the final result of the SAE port I installed into the hole I drilled, the bits and pouch (also paper template I make to pre mark the hole). Unfortunately, I didn’t think to take a picture before installing the port but if I do pull it all apart, I will update this post. My only regret is not getting a set of these sooner because of the time-savings alone. Writing this review because it is seldom that I’m this happy with a purchase, lol. Also was not expecting the divider pouch which my ODC also loves.

Bought this item to widen 2 holes in 1/8" steel. I knew these were cheap and would not last long but I thought I would get at least the 2 holes I needed resized. I used cutting oil, and before I got the 1st hold widened 1 set it was dull and would not cut anymore. There were 2 that supported the 18mm hole size that I needed. So on the second one I removed the oil and it did not even remove and of the metal before it was dull. Stay away from these unless you are drilling through a soda can.

Used one time and will not bore holes

I am mid-process converting an '06 PT Cruiser from US, to UK market specs for a future move. As such, side marker/repeaters must be installed to repeat the blinker light signal. I had bought a set I loved from the UK, designed for a mini. After some modification to the repeaters all I had to do was cut a 22mm hole in the sheet metal in my front wings to mount them, I stuck them down with 3M VHB tape to ensure years/decades of secure fitting. I fully expected these to break drilling a hole of that size into sheet metal, however I was completely wrong and my mistrust was mis founded. After marking the spot with a sharpie, and drilling a 0.5mm pilot hole, the rest was easy. I drilled at half speed with a $16 cordless Hyper Tough drill and it had no trouble, and I was able to mount my new parts with ease. I then used them again to drill additional holes inside the wing and on the inner fender to run the wires through, and secured these with rubber grommets. I would certainly use these again in future projects, they are fantastic for the price. Included a picture to show the final product.