--- product_id: 406976280 title: "INTOO Hss Cobalt Drill Bits Set 21PCS Triangle Shank,Industry Drill bits with Golden Ratio Tip," brand: "intoo" price: "$U10907" currency: UYU in_stock: true reviews_count: 5 category: "Intoo" url: https://www.desertcart.uy/products/406976280-intoo-hss-cobalt-drill-bits-set-21pcs-triangle-shank-industry store_origin: UY region: Uruguay --- # Golden Ratio tip for 3x longer life 21 precision sizes 1/16"–3/8" 5% cobalt for max durability INTOO Hss Cobalt Drill Bits Set 21PCS Triangle Shank,Industry Drill bits with Golden Ratio Tip, **Brand:** intoo **Price:** $U10907 **Availability:** ✅ In Stock ## Summary > ⚡ Drill Smarter, Last Longer — The Ultimate Cobalt Powerhouse! ## Quick Answers - **What is this?** INTOO Hss Cobalt Drill Bits Set 21PCS Triangle Shank,Industry Drill bits with Golden Ratio Tip, by intoo - **How much does it cost?** $U10907 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.uy](https://www.desertcart.uy/products/406976280-intoo-hss-cobalt-drill-bits-set-21pcs-triangle-shank-industry) ## Best For - intoo enthusiasts ## Why This Product - Trusted intoo brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Complete 21-Piece Set:** From micro 1/16" to robust 3/8", every size you need in one sleek kit. - • **Triangle Shank Stability:** Ergonomic triangle shank prevents slipping, delivering consistent, professional results. - • **Durable Metal Storage Box:** Compact, rugged case keeps your bits organized and ready for any heavy-duty project. - • **Golden Ratio Precision Tip:** Patented tip design ensures ultra-clean holes and extends bit life by at least 3x. - • **Industrial-Grade Cobalt Alloy:** 5% cobalt blend engineered for superior wear resistance on stainless steel and hard metals. ## Overview The INTOO 21PCS HSS Cobalt Drill Bit Set features a comprehensive range of sizes (1/16" to 3/8") with a patented Golden Ratio tip for precision and longevity. Crafted from 5% cobalt alloy, these bits excel in drilling hard metals like stainless steel, offering 3x longer life than standard bits. The triangle shank design ensures superior grip and stability, all housed in a durable metal storage box for professional-grade convenience. ## Description Specification:21PCS COBALT DRILL BIT SET： 1/16,5/64,3/32,7/64,1/8,9/64,5/32,11/64,3/16,13/64,7/32,15/64,1/4,17/64,9/32,19/64,5/16,21/64,11/32,32/64,3/8. Sizes from 1/8 to 3/8 with triangle shank. Product Feature: Material:HSS M35 (COBALT 5%)Angle Point: 135 Degree with Golden Ratio Tip.Shank Type:Triangle ShankHardness:63-64 RockwellApplication: widely used for hevery industry purpose in hard stainless still or any hard metal.Instructions:simply insert drills to chucks or power tools,suggest RPM:500R/M Precautions:Make sure to put on masks and gloves before drilling.Keep cool or discontinuous use will largely prolong drill life.High performace and reliable quality to be promised by INTOO! Review: Works for most household stuff. Points do not hold up well on cast iron or harder materials (stainless, tool steel etc). Certainly sharp for the first use - but don't expect great longevity. Review: Good quality ## Features - SPECIFICATIONS:21PCS COBALT DRILL BIT SET： 1/16,5/64,3/32,7/64,1/8,9/64,5/32,11/64,3/16,13/64,7/32,15/64,1/4,17/64,9/32,19/64,5/16,21/64,11/32,32/64,3/8.Sizes from 1/8 to 3/8 with triangle shank. - GOLDEN RATIO TIP:From size 5/32" with patented "Golden Ratio" Tip,which especially designed for heavy duty purpose, effect clean&smooth holes on hard metal like stainless steel,and moreover, at least 3 times longer life. - COBALT 5% MATERIAL: suitable for stainless steel or any hard metal,significantly increases the ware-resistance and durability. - STORAGE BOX:strong metal box. - HOW TO USE:controlling the drilling speed by lowest RPM would make drill life much longer than 3 times. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B09CYL9DMW | | ASIN | B09CYL9DMW | | Batteries Included? | No | | Batteries Required? | No | | Customer Reviews | 4.2 4.2 out of 5 stars (109) | | Customer reviews | 4.2 4.2 out of 5 stars (109) | | Date First Available | 30 October 2021 | | Date First Available | 30 October 2021 | | Finish | Amber finish | | Item Weight | 454 g | | Item model number | CO21 | | Item model number | CO21 | | Manufacturer | INTOO | | Manufacturer | INTOO | | Material | Cobalt, Metal, hss m35 | | Number Of Pieces | 21 | | Package Dimensions | 16.51 x 11.43 x 4.32 cm; 453.59 g | | Package Dimensions | 16.51 x 11.43 x 4.32 cm; 453.59 g | | Part number | CO21 | | Pattern | Unique Patented Tip Design with Varying Sizes | | Style | M35-21PCS | ## Product Details - **Brand:** INTOO - **Finish type:** Amber finish - **Material:** Cobalt, Metal, hss m35 - **Shank type:** Triangle - **Tool flute type:** Spiral ## Images ![INTOO Hss Cobalt Drill Bits Set 21PCS Triangle Shank,Industry Drill bits with Golden Ratio Tip, - Image 1](https://m.media-amazon.com/images/I/71tgIXiD9zL.jpg) ![INTOO Hss Cobalt Drill Bits Set 21PCS Triangle Shank,Industry Drill bits with Golden Ratio Tip, - Image 2](https://m.media-amazon.com/images/I/616eJnP4ILL.jpg) ![INTOO Hss Cobalt Drill Bits Set 21PCS Triangle Shank,Industry Drill bits with Golden Ratio Tip, - Image 3](https://m.media-amazon.com/images/I/61C+GIrSKVL.jpg) ![INTOO Hss Cobalt Drill Bits Set 21PCS Triangle Shank,Industry Drill bits with Golden Ratio Tip, - Image 4](https://m.media-amazon.com/images/I/6118jHjFm0L.jpg) ![INTOO Hss Cobalt Drill Bits Set 21PCS Triangle Shank,Industry Drill bits with Golden Ratio Tip, - Image 5](https://m.media-amazon.com/images/I/51zAxY4bFLL.jpg) ## Questions & Answers **Q: Thank you for answering my first question. you said, "we takes the highest grade of the first one", do you mean highest grade of tin?** A: Not only Tin, but also thickness of the Tin. **Q: Where are they manufactured?** A: Made in PRC **Q: How do these do drilling through 1/4 steel?** A: They do fine if you use cutting oil. If you try to drill it dry the bits will just spin and wear out. **Q: What kind of titanium coating is on these? titanium nitride (tin), titanium carbonitride (ticn), titanium aluminum nitride (tiain)? thanks** A: We use the first type（TIN）, but we takes the highest grade of the first one in terms of thickness, abrasion resistance and finish. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by M***S on 17 January 2026* Works for most household stuff. Points do not hold up well on cast iron or harder materials (stainless, tool steel etc). Certainly sharp for the first use - but don't expect great longevity. ### ⭐⭐⭐⭐⭐ Review *by A***R on 31 July 2025* Good quality ### ⭐⭐⭐⭐⭐ Review *by D***G on 20 December 2022* Broke a bolt off in an engine block. My usual drill bits would not drill the center out for using an "easy-out" extractror, so I ordered these and they cut the hardened metal that bolt was made of and I was able to get it out. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.uy/products/406976280-intoo-hss-cobalt-drill-bits-set-21pcs-triangle-shank-industry](https://www.desertcart.uy/products/406976280-intoo-hss-cobalt-drill-bits-set-21pcs-triangle-shank-industry) --- *Product available on Desertcart Uruguay* *Store origin: UY* *Last updated: 2026-04-25*