--- product_id: 46006807 title: "BOSCH CO21 21-Piece Assorted Set with Included Case Cobalt Metal Drill Bit with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, Light-Gauge Metal, Aluminum" brand: "bosch" price: "₩143829" currency: KRW in_stock: true reviews_count: 13 category: "Bosch" url: https://www.desertcart.kr/products/46006807-bosch-co21-21-piece-assorted-set-with-included-case-cobalt store_origin: KR region: South Korea --- # No-skate split-point tip Three-flat shank anti-slip grip 4X longer life cobalt bits BOSCH CO21 21-Piece Assorted Set with Included Case Cobalt Metal Drill Bit with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, Light-Gauge Metal, Aluminum **Brand:** bosch **Price:** ₩143829 **Availability:** ✅ In Stock ## Summary > 🔧 Drill Like a Pro, Last Like a Legend ## Quick Answers - **What is this?** BOSCH CO21 21-Piece Assorted Set with Included Case Cobalt Metal Drill Bit with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, Light-Gauge Metal, Aluminum by bosch - **How much does it cost?** ₩143829 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/46006807-bosch-co21-21-piece-assorted-set-with-included-case-cobalt) ## Best For - bosch enthusiasts ## Why This Product - Trusted bosch brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Grip That Won't Quit:** Three-flat shank design prevents slipping on larger bits for maximum control and safety. - • **Precision Every Time:** No-skate split-point tip ensures clean, accurate holes with zero wandering—perfect starts guaranteed. - • **Heat-Resistant Powerhouse:** Engineered for high-temperature drilling in tough metals—keep your workflow unstoppable. - • **Versatility in Your Toolbox:** 21 assorted sizes laser-etched for quick identification—drill through stainless steel, cast iron, titanium, and more. - • **Built to Last, Built to Perform:** Cobalt construction delivers 4X longer life than standard bits—work smarter, not harder. ## Overview The Bosch CO21 21-piece cobalt metal drill bit set is engineered for professionals demanding durability and precision. Featuring a no-skate split-point tip and three-flat shank design, these bits deliver 4X longer life and superior grip for drilling through stainless steel, cast iron, titanium, and light-gauge metals. With laser-etched sizes and heat-resistant performance, this set is your ultimate partner for reliable, clean, and efficient drilling. ## Description Bosch Cobalt metal drill bits provide 4x longer life than standard high-speed steel drill bits, plus they provide outstanding performance in stainless steel. These have been engineered for contractors and other pros who need solid, reliable bits for demanding drilling applications in stainless, cast iron, and high-density metal. These bits also are useful for general-application drilling in high-carbon steel and light-gauge metal, as well as wood and plastic. The split-point tip has been engineered for no-skate starts and clean, accurate holes. The three-flat shank design on bits 3/16 in. And larger promotes better gripping and guards against slipping.Includes bits: (2) 1/16", (2) 5/64", (1) 3/32", (1) 7/64", (2) 1/8", (1) 9/64", (1) 5/32", (1) 11/64", (2) 3/16", (1) 13/64", (1) 7/32", (1) 15/64", (2) 1/4", (1) 5/16", (1) 3/8", (1) 1/2" Review: Good bit - Worked well for what I need you to do. Bites well Review: Great bits. Lousy labels. - 5/27/2026 : great drill bits. Nice storage. Awful labeling. I had to use tape and marker to label these for myself. Bosch really needs to fix this. Already some numbers were hard to read after a little dust got on the case. Even the labels on the bits are nearly impossible to read. Why Bosch? Who are those labels meant for? People who WANT to make silly errors, and make life so much harder than it needs to be. Take my advice. Label it carefully yourself in five minutes, and save yourself HOURS of cumulative time trying to figure out which size is which. ## Features - TOUGH: The Bosch CO21 Drill Bit Set is manufactured from cobalt for drilling in hard and abrasive materials such as stainless, cast iron, and high-density metal. Also useful for general drilling in light-gauge metal, wood, and plastic. - ACCURACY: Featuring a no-skate split-point tip for clean, precise holes and accurate starts. - RELIABLE: The three-flat shank design promotes better grip and guards against slipping on bits 3/16 in. and larger - PERFORMANCE: Designed for very high drilling temperatures for superior performance in stainless steel. Bosch Cobalt Metal Drill Bits are solid, reliable, and provide 4X longer life than standard high-speed drill bits. - VERSATILITY: Includes laser-etched marking to provide clearly marked bit diameter. Included bit sizes: 1/16 in., 5/64 in., 3/32 in., 7/64 in., 1/8 in., 9/64 in., 5/32 in.,11/64 in., 3/16 in., 13/64 in., 7/32 in., 15/64 in., 1/4 in., 5/16 in., 3/8 in., 1/2 in. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B06XY7W87H | | Best Sellers Rank | #52,880 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #131 in Jobber Drill Bits | | Brand | Bosch | | Brand Name | Bosch | | Customer Reviews | 4.7 out of 5 stars 8,037 Reviews | | Cutting Angle String | 135 Degrees | | Cutting Diameter | 0.5 Inches | | Finish Type | Titanium | | Finish Types | Titanium | | Global Trade Identification Number | 00000346471540 | | Included Components | Bit Sizes: (2) 1/16", (2) 5/64", (1) 3/32", (1) 7/64", (2) 1/8", (1) 9/64", (1) 5/32", (1) 11/64", (2) 3/16", (1) 13/64", (1) 7/32", (1) 15/64", (2) 1/4", (1) 5/16", (1) 3/8", (1) 1/2" | | Item Dimensions | 4.6 x 9 x 1.5 inches | | Item Type Name | CO21 Cobalt Metal Drill Bit Set (21 Piece) | | Item Weight | 1.1 Pounds | | Manufacturer | Bosch | | Material | Stainless Steel | | Material Type | Stainless Steel | | Model | CO21 | | Number of Flutes | 2 | | Number of Pieces | 21 | | Part Number | CO21 | | Point Style | Split Point | | Set Name | 21-Piece Assorted Set | | Shank Type | 3-Flat | | Surface Recommendation | Cast Iron,Metal,Plastic,Stainless,Stainless Steel,Steel,Wood | | Tool Flute Type | Spiral | | UPC | 000346471540 | | Unit Count | 1.0 Count | ## Product Details - **Cutting Angle String:** 135 Degrees - **Cutting Diameter:** 0.5 Inches - **Finish Type:** Titanium - **Material:** Stainless Steel - **Shank Type:** 3-Flat ## Images ![BOSCH CO21 21-Piece Assorted Set with Included Case Cobalt Metal Drill Bit with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, Light-Gauge Metal, Aluminum - Image 1](https://m.media-amazon.com/images/I/91AEuVtQlJL.jpg) ## Available Options This product comes in different **Size, Number Of Items** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good bit *by S***R on May 13, 2026* Worked well for what I need you to do. Bites well ### ⭐⭐⭐⭐⭐ Great bits. Lousy labels. *by M***4 on May 27, 2026* 5/27/2026 : great drill bits. Nice storage. Awful labeling. I had to use tape and marker to label these for myself. Bosch really needs to fix this. Already some numbers were hard to read after a little dust got on the case. Even the labels on the bits are nearly impossible to read. Why Bosch? Who are those labels meant for? People who WANT to make silly errors, and make life so much harder than it needs to be. Take my advice. Label it carefully yourself in five minutes, and save yourself HOURS of cumulative time trying to figure out which size is which. ### ⭐⭐⭐⭐⭐ Strong bits competitively priced *by A***O on April 3, 2026* Good value for the money. I use these bits to drill mild steel and aluminum and haven’t noticed any major wear on them so far. ## Frequently Bought Together - Bosch CO21 Cobalt Metal Drill Bit Set (21 Piece) - Forney 20857 Tap Magic Industrial Pro Cutting Fluid, 4 oz - BOSCH CO14B 14-Piece Assorted Set with Included Case - Cobalt M42 Metal Drill Bits with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, and Light-Gauge Metal --- ## 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.kr/products/46006807-bosch-co21-21-piece-assorted-set-with-included-case-cobalt](https://www.desertcart.kr/products/46006807-bosch-co21-21-piece-assorted-set-with-included-case-cobalt) --- *Product available on Desertcart South Korea* *Store origin: KR* *Last updated: 2026-07-06*