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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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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

📏19pcs, 1-10mm in 0.5mm increments - precision versatility

🔥68-70 HRC Rockwell Hardness - heat & wear resistant

⚙️M42 8% Cobalt Steel - ultra durable

B/.398

Duties & taxes included

In stock

Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

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Description

🔩 Drill Smarter, Not Harder — Own the toughest jobs with precision and speed!

LONG TERM VALUE - Despite a premium price, the extended tool life and faster drilling reduce your cost per hole dramatically.
CUT THROUGH TOUGHNESS - Premium M42 cobalt steel delivers unmatched heat and wear resistance for stainless steel and hard metals.
PRECISION ENGINEERING - 19-piece set with 0.5mm incremental sizes ensures the perfect fit for every project, from delicate plastics to dense metals.
SPEED MEETS EFFICIENCY - 3-step split point design starts drilling immediately with less force, running 3-5x faster than standard bits.
PRO LEVEL PERFORMANCE TIPS - Optimized RPM guidelines and lubrication advice included to maximize bit lifespan and drilling quality.

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 for professionals tackling stainless steel, hard metals, and more, this set offers superior heat resistance, wear durability, and a 3-step split point tip for faster, cleaner drilling. Ideal for millennial managers who demand efficiency and reliability in their toolkit.

Specifications

Asin	B07MZQMPMC
Best Sellers Rank	#207,466 in Home Improvement (See Top 100 in Home Improvement) #1,580 in Drill Bit Sets
Brand Name	STROTON
Country Of Origin	USA
Customer Reviews	4.4 4.4 out of 5 stars (4,692) 4.4 out of 5 stars
Cutting Angle String	135 Degrees
Cutting Diameter	9.5 Millimetres
Finish Types	Hardened
Included Components	drill bits
Item Weight	1 Pounds
Manufacturer	STROTON Ltd
Material Type	Cobalt
Minimum Bore Diameter	1 Millimetres
Number Of Flutes	1
Number Of Packs	1
Number Of Pieces	19
Part Number	M42 Cobalt-8(19pcs)
Point Style	Split Point
Set Name	1-10mm (19PCS)
Shank Type	Straight
Surface Recommendation	Metal, Plastic, Wood
Tool Flute Type	twist
Unit Count	1.0 Count
Upc	743829466298

Reviews

User

Best in high temperature work

Best performance drill bits

6.04.2026

User

Excelente producto

Puedes hacer agujeros con facilidad en metales duros como inox 316

28.05.2026

User

Si duran

Las compré para inoxidables y se soporta las cargas como todo con el uso prolongado van perdiendo filo pero dura bastante para su precio

16.08.2023

User

So far, so good.

This set of drill bits had all the bits I needed for the job it was purchased for. At this stage they are handling the job and lasting. Looks like the right tool for the job, so far.

5.02.2024

User

Brocas metálica

GosteiAs brocas são muito boas

6.04.2026

User

Good quality

Very good quality

20.12.2025

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

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Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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B/.398

Duties & taxes included

In stock

Sold byAmazon PanamaDelivered 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 Panama.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

View all Trustpilot reviews