GMTOOLS 29Pcs Cobalt Drill Bits Set M35 High Speed Steel 135 Degree Tip For Hardened Metal Stainless Steel Wood With Metal Case 1/16 Inch To 1/2 Inch
Why you'll like it
- Enhanced durability — Made from industry-grade 6542 high speed steel with 5 percent cobalt alloy to resist extreme heat and wear during tough jobs.
- Precise drilling starts — Features a 135-degree split point self-centering tip that eliminates bit walking and penetrates surfaces faster with minimal pressure.
- Versatile material compatibility — Engineered to drill cleanly through hardened metals, stainless steel, cast iron, alloy steel, wood, and plastic.
- Complete size range — Includes 29 fractional twist bits from 1/16 inch to 1/2 inch housed securely in a durable metal indexed storage case.
Product details
Description
Tackle demanding heavy-duty drilling applications with the GMTOOLS 29-Piece Cobalt Drill Bit Set, crafted from premium M35 high-speed steel enhanced with a 5 percent cobalt alloy. Engineered for exceptional heat resistance and long-lasting wear durability, these jobber-length twist drill bits easily slice through hard materials including stainless steel, cast iron, titanium alloy, hardened metals, as well as softer surfaces like wood and plastic.
Featuring a precision-ground 135-degree split point tip, the bits self-center instantly upon contact to minimize bit walking and require less downward pressure for faster penetration. Spiral flutes clear chips efficiently to maintain a cool and clean cutting zone.
This complete kit includes 29 fractional sizes ranging from 1/16 inch up to 1/2 inch, neatly organized inside a heavy-duty metal indexed storage case for rapid size identification and secure jobsite portability.
How to use
- Select the correct drill bit size from the metal indexed case.
- Securely insert the straight shank into your tool holding system or power drill chuck.
- Align the 135-degree split point tip perpendicular to the workpiece surface and apply steady, moderate pressure while drilling.
- Use cutting fluid when working with hard metals like stainless steel or cast iron to extend bit life.
- Clean and store bits back in their designated slots after use.
Ingredients
M35 High-Speed Steel with 5% Cobalt Alloy
As printed by the brand. Check the pack label if you have an allergy.
Specifications
| Brand | GMTOOLS |
|---|---|
| Ships from | USA (sourced directly), checked in Navi Mumbai |
| Sold by | Dropy.in |
Ratings & reviews
From our customers
Top reviews first: highest rated, with photos first
- Amit S.5 ★
ordered two more sets for brothers
bought one set last month for my garage workshop and after seeing how easily it drills through hardened steel and even wood or plastic, ordered two more for my brothers who do fabrication work. having 29 fractional sizes in one neat metal case saves so much hassle. self centering tip saves a lot of downward pressure. happy with the purchase.
- Sandeep K.5 ★
pehli baar li ye brand, mast nikli
pehli daal use kiya ye wala set. pehle thoda doubt tha ki kaise chalega cast iron aur titanium alloy pe, pan chote sizes ne bhi bina kisi dikkat ke cut kar diya. wo metal box me jo indexing hai na, usse size dhoondhna ekdum aasan ho jata hai, extra time waste nahi hota. spiral flutes chips ko achhe se clear kar dete hain toh cutting area clean rehta hai. waise toh mai pehli baar try kar raha tha is brand ko, par ab lagta hai paisa wasool ho gaya.
- Vikram M.5 ★
pichle wale se bohot better hai
mera purana standard set hard metal pe kaam karte waqt turant ghis jata tha aur tip toot jati thi. isme m35 high speed steel aur cobalt alloy hai toh heat bohot achhe se handle kar leta hai. 1/16 inch se lekar 1/2 inch tak saare 29 sizes mil gaye jo ghar aur workshop ke har kaam ke liye kafi hain. thoda dhyan rakhna padta hai ki heavy materials pe slow speed pe chalau warna brittle ho sakte hain, par performance ekdum solid hai.
- Rohan D.5 ★
box was slightly damaged but bits are solid
got the delivery yesterday and the outer carton was a bit crushed which scared me, thankfully the heavy duty metal indexed storage case inside protected everything. tested a couple of pieces on some old stainless steel plates and it went through cleanly without slipping. the 135 degree split point tip actually works as claimed and catches right away instead of wandering all over the surface. packaging could have been better handled by the courier guys but the product itself is top quality.
FAQs
What are M35 cobalt drill bits?
M35 cobalt drill bits are high-performance cutting tools made from high-speed steel alloyed with 5 percent cobalt. This specialized composition allows them to maintain structural integrity and cutting edge sharpness at much higher operating temperatures than standard HSS bits.
Is a cobalt drill bit good for stainless steel?
Yes, cobalt drill bits are specifically engineered for cutting through tough, abrasive, and high-tensile materials like stainless steel, cast iron, and hardened metals without overheating or dulling quickly.
What sizes are included in this 29-piece set?
This comprehensive kit includes 29 fractional sizes ranging sequentially from 1/16 inch up to 1/2 inch, covering every standard incremental measurement needed for professional and workshop applications.
Are these products authentic USA imports available in India?
Yes, this product is an authentic USA import sourced directly from the United States, bringing professional-grade tooling performance straight to your workshop in India through Dropy.
What is the benefit of a 135-degree split point tip?
The 135-degree split point tip automatically centers itself on contact, which prevents the bit from slipping or walking across hard surfaces and allows for faster, cleaner penetration with less manual effort.
How long will delivery take?
Most orders arrive in 15–20 days: we source each product directly from the USA, check it at our Navi Mumbai warehouse and pack it on video. Items marked Dropy Express ship from our India warehouse and arrive in 3–5 days.
Is cash on delivery available?
Full cash on delivery is available all over India on Dropy Express items. For other orders from ₹2,499 to ₹15,000 you can use Partial COD: pay 25% online now and the rest in cash on delivery.
Are your products genuine?
Yes. Every product is 100% authentic, sourced directly from the USA, quality-checked and packed on video at our Navi Mumbai warehouse.
What if my order arrives damaged or wrong?
Write to us at [email protected] as soon as it arrives. Damaged, wrong or not as described, our Buyer Protection gives you a full refund. The details are in our Return, Refund & Cancellation Policy.
Is delivery free?
Delivery is free on orders from ₹1,499. Below that a ₹79 delivery fee applies.