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. These feature standard round straight shanks. The largest diameter is 10mm, allowing them to fit securely into any standard 3/8-inch (10mm) or 1/2-inch (13mm) drill chuck.

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. These bits feature a 135° Split Point tip. This design is self-centering and cuts immediately upon contact with the metal, preventing the bit from "walking" or skating across the surface.

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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Hymnorq 15-Piece M35 Cobalt Drill Bit Set, Metric 1.5 to 10mm, 5% Cobalt HSS for Drilling Hard Metal Stainless Steel Cast Iron, Fully Ground Jobber Length Bits with 135° Split Point Tough Indexed Case

Hymnorq 15-Piece M35 Cobalt Drill Bit Set, Metric 1.5 to 10mm, 5% Cobalt HSS for Drilling Hard Metal Stainless Steel Cast Iron, Fully Ground Jobber Length Bits with 135° Split Point Tough Indexed Case

Product ID: 86329568

Details

Cutting angle string
135 Degrees
Cutting diameter
10 Millimetres
Finish type
Bronze
Material
Cobalt Steel
Shank type
Straight

📐135° split point for precision starts

⚙️5% Cobalt HSS for extreme heat resistance

🛠️15 metric sizes in rugged indexed case

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€ 56.64

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Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Drill Like a Pro, Finish Like a Boss

COMPLETE METRIC COVERAGE - 15 essential sizes from 1.5mm to 10mm cover all your metalworking, automotive, and DIY needs.
RUGGED READY TO GO CASE - Impact-resistant ABS case with rubber corners and raised size markings keeps your bits organized and protected on the move.
ENGINEERED FOR EFFICIENCY - Fully ground bits with dual-flute design ensure rapid chip removal and cooler drilling, extending bit life.
PINPOINT ACCURACY EVERY TIME - 135° split point self-centers instantly—no pilot hole needed, eliminating bit walking for flawless holes.
CUT THROUGH STEEL LIKE BUTTER - M35 cobalt steel with 5% cobalt boosts heat resistance and durability for stainless steel, cast iron, and titanium drilling.

The Hymnorq 15-Piece M35 Cobalt Drill Bit Set features premium 5% cobalt high-speed steel bits engineered for superior heat resistance and durability. With a precision 135° split point for self-centering accuracy and fully ground dual-flute design for efficient chip removal, this set delivers clean, precise holes in hard metals like stainless steel and cast iron. Housed in a tough indexed ABS case, it offers 15 metric sizes (1.5-10mm) ideal for professionals and serious DIYers tackling demanding metalworking projects.

Specifications

ASIN	B07B7L6WVY
Best Sellers Rank	814,688 in DIY & Tools ( See Top 100 in DIY & Tools ) 1,006 in Jobber Drill Bits
Brand	Hymnorq
Customer Reviews	4.4 4.4 out of 5 stars (2,446)
Cutting Angle String	135 Degrees
Cutting Diameter	10 Millimetres
Finish Types	Bronze
Included Components	15 pieces of metric cobalt drill bits
Item Dimensions	15 x 11 x 4 centimetres
Manufacturer	Hymnorq
Manufacturer Part Number	B07B7L6WVY
Material	Cobalt Steel
Minimum Bore Diameter	1.5 Millimetres
Model Number	B07B7L6WVY
Number of Flutes	2
Number of Pieces	15
Point Style	Split Point
Set Name	15PC Set
Shank Type	Straight
Surface Recommendation	Metal
Tool Flute Type	Spiral
UPC	666389162076
Unit Count	1.0 count

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€ 56.64

Duties & taxes included

In stock

Sold byAmazon ItalyDelivered 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 Italy.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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