Can these drill through a car's trunk without any issues?

These are made to drill through thick hard steel. Thus are very hard and brittle and will break easily if improper angle is applied. For drilling trunk or locks use a titanium bit and buy a few of them as they dull quick but get the job done.

Bought the 19 pc set; 3mm but broke immediately. Can anyone point me to where I can buy replacement? Thank you.

Hi,I am the seller. You need to click the blue word [STROTON] in "Sold by STROTON and Fulfilled by Amazon" below the "Add to Cart" of this Drill bit's listing. Then click [Ask a question] that write the condtion simply to Establish contact channels with me through Amazon message system. Then I can handle the follow-up to your order. Best regards STROTON

Can they drill titanium

Honestly,They are good for drilling steel and do the job well. But Titanium alloy has very high hardness. And We can't guarantee. If it doesn't work well, you could return it. If it works（Lubricant Must Be Used）, you could share it with other customers.

What is the length of these bits?

They are average lengths. The 1mm is 3.4cm and length increase proportionally to the 10mm which is 5.4cm.

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Metric M42 8% Cobalt Twist Drill Bits Set for Stainless Steel and Hard Metal (1mm-10mm/19pcs)

Metric M42 8% Cobalt Twist Drill Bits Set for Stainless Steel and Hard Metal (1mm-10mm/19pcs)

Product ID: 442712405

Details

Cutting Angle String
135 Degrees
Cutting Diameter
9.5
Finish Type
Hardened
Material
Cobalt
Shank Type
Straight

⏩3-5x faster drilling speed vs standard bits

🔥68-70 HRC Rockwell Hardness for heat & wear resistance

⚙️M42 8% Cobalt Steel for ultimate durability

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฿13928

Duties & taxes included

In stock

Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Drill Smarter, Last Longer – The Ultimate Cobalt Powerhouse

PREMIUM M 42 COBALT ALLOY - Unmatched heat & wear resistance ensures long-lasting performance on stainless steel and hard metals
OPTIMIZED FOR STAINLESS STEEL - Ideal RPM guidelines and lubrication tips included for flawless, chip-free holes
VERSATILE 19 PIECE METRIC SET - Covers 1mm to 10mm in 0.5mm increments for every professional project
COST EFFECTIVE HIGH SPEED DRILLING - Runs 3-5x faster, drastically lowering cost per hole despite premium quality
PRECISION ENGINEERED 3 STEP SPLIT POINT - Starts drilling instantly with zero walking for flawless accuracy

The Metric M42 8% Cobalt Twist Drill Bits Set features 19 precision-engineered bits ranging from 1mm to 10mm, crafted from premium M42 cobalt steel with a 68-70 HRC rating. Designed with a 3-step split point tip, these bits deliver superior heat and wear resistance, enabling 3-5 times faster drilling through stainless steel, hard metals, and more. This set offers professional-grade durability and efficiency, making it the go-to choice for millennial managers demanding precision and longevity in their toolkit.

Specifications

ASIN	B07MZQMPMC
Best Sellers Rank	#186,544 in Home Improvement ( See Top 100 in Home Improvement ) #1,443 in Drill Bit Sets
Brand	STROTON
Brand Name	STROTON
Country of Origin	USA
Customer Reviews	4.4 out of 5 stars 4,387 Reviews
Cutting Angle String	135 Degrees
Cutting Diameter	9.5 Millimetres
Finish Type	Hardened
Finish Types	Hardened
Included Components	drill bits
Item Weight	1 Pounds
Manufacturer	STROTON Ltd
Material	Cobalt
Material Type	Cobalt
Minimum Bore Diameter	1 Millimetres
Number of Flutes	1
Point Style	Split Point
Shank Type	Straight
Surface Recommendation	Metal, Plastic, Wood
Tool Flute Type	twist
UPC	743829466298
Unit Count	1.0 Count

Reviews

J**A

Best in high temperature work

Best performance drill bits

6.04.2026

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