Can these drill bits cut through hardened steel or stainless steel?

Yes. M35 grade steel with 5% Cobalt is specifically engineered for high-tensile metals like stainless steel, cast iron, and titanium alloys. For fully hardened steel (HRC > 50), carbide bits are recommended.

Will these bits fit my standard cordless drill?

Yes, absolutely! These drill bits feature a universal straight round shank. They are fully compatible and will lock securely into the standard chucks of almost all portable cordless drills, corded power hand drills, and drill presses.

Do I need to use cutting oil or lubricant?

Highly recommended. While Cobalt is heat-resistant, using cutting fluid significantly reduces friction and heat buildup. This prevents the bit from annealing (softening) and greatly extends its lifespan.

Do these bits require a center punch to start?

No center punch needed. They feature a 135° split point that provides immediate self-centering. This prevents walking or slipping on hard metals like stainless steel, allowing you to start your hole precisely and directly every time.

Are these bits just coated with Cobalt or solid?

They are solid M35 Cobalt steel throughout, not just coated. Unlike titanium-coated bits that lose effectiveness once sharpened, these maintain their heat resistance and performance even after resharpening.

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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10-Piece M35 Cobalt Steel Drill Bit Set for Metals, 4.2mm Metric, Fully Ground, 135° Split Point, Bronze Finish, DIN338 Standard, in Tough Transparent PP Case

Product ID: 736125928

Details

Cutting angle string
135 Degrees
Cutting diameter
4.2
Finish type
Bronze
Material
Cobalt
Shank type
Straight

🔥135° split point reduces heat & walking

⚙️M35 cobalt steel for max durability

🛠️DIN338 standard for pro-grade precision

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Description

🔩 Drill Like a Pro, Finish Like a Boss!

COMPACT ORGANIZED - Tough transparent PP case keeps your bits secure, visible, and ready to go wherever you work.
PERFECT FIT FINISH - 4.2mm diameter with chamfered straight shanks ensures seamless tool compatibility and corrosion resistance.
UNMATCHED DURABILITY - Crafted with 5% cobalt M35 steel to withstand intense heat and heavy use without dulling.
PRECISION ENGINEERING - Fully ground bits with dual twist flutes and a 135° split point for smooth, accurate drilling every time.
VERSATILE METAL MASTERY - Optimized for stainless steel, brass, aluminum, and more—plus wood and plastic for all your projects.

This 10-piece M35 cobalt steel drill bit set delivers professional-grade performance with superior heat resistance and precision. Featuring a 135° split point and fully ground dual twist flutes, these 4.2mm bits excel on metals, wood, and plastics. Packaged in a durable transparent case, they meet DIN338 standards for reliability and ease of use—perfect for managers who demand efficiency and quality in every project.

Specifications

ASIN	B07CN2J51P
ASIN	B07CN2J51P
Brand Name	HYMNORQ
Customer Reviews	4.3 4.3 out of 5 stars (78)
Customer reviews	4.3 4.3 out of 5 stars (78)
Cutting Angle String	135 Degrees
Cutting Diameter	4.2 Millimeters
Date First Available	19 March 2021
Finish Types	Bronze
Included Components	10 pieces of 4.2mm cobalt drill bits
Is Discontinued By Manufacturer	No
Item model number	LZXGY0131US
Manufacturer	Hymnorq
Manufacturer	Hymnorq
Material Type	Cobalt
Minimum Bore Diameter	4.2 Millimeters
Model	LZXGY0131US
Number of Flutes	2
Number of Pieces	10
Package Dimensions	10.5 x 6.4 x 0.9 cm; 85 g
Part Number	LZXGY0131US
Point Style	split
Shank Type	Straight
Surface Recommendation	Stainless Steel, Brass, Copper, Iron, Aluminum Alloy, Angle Steel, Cast Iron, Wood, Plastic
Tool Flute Type	Spiral
UPC	666389312495
Unit Count	10 Count

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16827CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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