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 Bit for Stainless Steel and Hard Metals(1mm-10mm / 19pcs)

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

Product ID: 766631610

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Details

Material
Cobalt
Finish Type
Hardened
Shank Type
Straight
Cutting Angle String
90 Degrees
Brand
STROTON

⏩3-5x faster drilling speed

🔥68-70 HRC Rockwell Hardness - extreme heat resistance

⚙️M42 8% Cobalt Steel - ultra durable

Description

🔥 Drill Smarter, Not Harder – Own the Metal Game!

PRECISION 3 STEP TIP - Eliminates walking for pinpoint accuracy on stainless steel and hard metals
SPEED MEETS STRENGTH - Drill 3-5 times faster without sacrificing durability or finish quality
VERSATILE 19 PIECE SET - Metric sizes from 1mm to 10mm cover every professional drilling need
OPTIMIZED FOR HARD METALS - Sharp 135° split point cuts clean iron chips, not dull grinding debris
PREMIUM COBALT COMPOSITION - 8% cobalt alloy ensures superior abrasion and heat resistance for longer bit life

The Metric M42 8% Cobalt Twist Drill Bit Set features 19 precision-engineered bits ranging from 1mm to 10mm, crafted from premium M42 cobalt steel with a 68-70 HRC rating. Designed for professionals tackling stainless steel, hard metals, aluminum, and plastics, these bits deliver 3-5x faster drilling speeds with superior heat and abrasion resistance. The innovative 3-step tip design ensures accuracy and clean cuts, making this set an essential upgrade for any serious toolkit.

Specifications

Manufacturer	STROTON
Part number	M42 Cobalt-8(19pcs)
Item Weight	454 g
Package Dimensions	17.8 x 12.6 x 4.5 cm; 453.59 g
Is Discontinued By Manufacturer	No
Finish	Hardened
Material	Cobalt
Pattern	1-10mm (19pcs)
Number Of Pieces	19
Measurement System	Metric
Included Components	Drill Bit
Batteries Included	No
Batteries Required?	No

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