These work pretty well as a general bit set for drilling most metals? Is applying oil generally needed on a surface when drilling?

While in trade school many decades ago, they taught us to use cooling for chisels and drill bits, I did dry drilling many times throughout the years, it works; however, cooling will extend the life of the drill bit for sure. One online resource said the following: If you don't cool, the material will harden and the drilling will get tougher. With special cutting oil, you cool both the material and the drill. This makes the drilling faster and more effective. The drill bits also last longer, because they stay sharp. Hope that this answers your question.

Are cobalt bits better than titanium bits?

Yes. Cobalt is harder and can drill through harder materials such as stainless steel.

Is the entire bit comprised of the M35 5% cobalt alloy or is the high cobalt steel just on the surfaces?

The entire bit is comprised of the M35 5% cobalt alloy. That is why they should last longer.

Will this fit in a standard household drill?

Our goal is to provide our customers with the highest quality and service. Yes this M35 HSS Drill Bit will fit just be mindful that this is a straight shank bit.

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GMTOOLS 13Pcs Cobalt Drill Bits Set, M35 HSS 135 Degree Tip, Twist Jobber Length Drill Bit Kit for Hardened Metal, Cast Iron, Stainless Steel, Plastic and Wood with Storage Case 1/16"-1/4"

GMTOOLS 13Pcs Cobalt Drill Bits Set, M35 HSS 135 Degree Tip, Twist Jobber Length Drill Bit Kit for Hardened Metal, Cast Iron, Stainless Steel, Plastic and Wood with Storage Case 1/16"-1/4"

Product ID: 469337353

Details

Cutting angle string
135 Degrees
Cutting diameter
6.35
Finish type
Titanium
Material
High Carbon
Shank type
Straight

🎯135° Split Point - fast, precise penetration

🧰13-Piece Set - versatile sizes 1/16" to 1/4"

⚙️M35 Cobalt Alloy - 5% cobalt for max durability

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Rp1746692

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Sold byAmazon IndonesiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔩 Drill Like a Pro, Finish Like a Boss!

ORGANIZED PORTABLE - Compact plastic case keeps your bits secure and ready for any job on the go.
UNMATCHED DURABILITY - M35 high-speed steel with 5% cobalt resists wear and heat for longer life.
VERSATILE SIZE RANGE - 13 drill bits from 1/16" to 1/4" cover all your metal, wood, and plastic projects.
PRECISION CUTTING EDGE - 135° split point design ensures quick, centered drilling with minimal walking.
EFFORTLESS CHIP REMOVAL - Twist design clears debris fast, keeping your workflow smooth and efficient.

This 13-piece M35 cobalt drill bit set features a 135° split point for fast, precise drilling into hardened metals, stainless steel, wood, and plastic. Crafted from durable high-speed steel with 5% cobalt, these bits resist wear and heat, ensuring long-lasting performance. The twist design promotes efficient chip removal, while the included storage case keeps your bits organized and portable. Perfect for professionals and DIYers seeking reliable, versatile drilling solutions.

Specifications

ASIN	B0B5R8P9ST
ASIN	B0B5R8P9ST
Best Sellers Rank	#172,312 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #705 in Power Drill Bit Sets
Brand Name	GMTOOLS
Customer Reviews	4.4 4.4 out of 5 stars (2,274)
Customer reviews	4.4 4.4 out of 5 stars (2,274)
Cutting Angle String	135 Degrees
Cutting Diameter	6.35 Millimeters
Date First Available	17 July 2022
Finish Types	Titanium
Manufacturer	GMTOOLS
Manufacturer	GMTOOLS
Manufacturer reference	Cobalt Twist Drill Bit
Material Type	High Carbon Steel
Number of Flutes	2
Number of Pieces	13
Package Dimensions	11.81 x 8.99 x 2.59 cm; 141 g
Part Number	Cobalt Twist Drill Bit
Point Style	Split Point
Set Name	13Pcs Cobalt Drill Bits Set
Shank Type	Straight
Surface Recommendation	Metal
Tool Flute Type	Spiral
Unit Count	1.0 Count

Reviews

D**P

Sharp and strong in a great case

10.04.2026

K**T

So far so good. Broke my original one and bought these. They drill nicely through stainless steel and I've only been using the 1 so far for a bunch of stainless holes.

10.03.2026

E**O

Increíblemente buenas, un excelente filo las e probado en aceros tratados y sin problema perforan, recomendado al 100%

23.08.2025

L**U

Very impressive with quality of the product. Drilled a lot of holes on the struts for a week already and they’re still very sharp.

11.02.2026

F**K

Best set of bits I have ever owned. Drilled through titanium plated stainless with no effort

20.04.2026

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