--- product_id: 46006807 title: "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: "฿12735" currency: THB in_stock: true reviews_count: 13 category: "Bosch" url: https://www.desertcart.co.th/products/46006807-co21-21-piece-assorted-set-with-included-case-cobalt-metal store_origin: TH region: Thailand --- # No-skate split-point tip Three-flat shank anti-slip grip 4X longer life cobalt steel 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:** ฿12735 **Availability:** ✅ In Stock ## Summary > 🔧 Drill Like a Pro, Last Like a Legend ## Quick Answers - **What is this?** 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?** ฿12735 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/46006807-co21-21-piece-assorted-set-with-included-case-cobalt-metal) ## 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 - • **Slip-Free Control:** Three-flat shank design locks in your grip, preventing slippage on larger bits for flawless drilling. - • **Precision Perfected:** No-skate split-point tip ensures clean, accurate holes every time—because details matter. - • **Unmatched Durability:** Engineered from premium cobalt for 4X longer life than standard bits—built to outlast your toughest projects. - • **Versatile Size Range:** 21 assorted sizes laser-etched for quick identification—ready for everything from delicate woodwork to heavy-duty metals. - • **Heat-Resistant Performance:** Designed to withstand extreme drilling temperatures, delivering superior results in stainless steel and cast iron. ## Overview The Bosch CO21 21-Piece Cobalt Metal Drill Bit Set combines industrial-grade cobalt steel with a no-skate split-point tip and three-flat shank design, delivering 4X longer life and superior precision for drilling through stainless steel, cast iron, titanium, and more. With 21 laser-etched sizes included, this set is engineered for professionals demanding reliability, heat resistance, and slip-free control across diverse materials. ## 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: Great product at a great price ! - Great for hard metals, excellent product. Review: German Quality - Superior to Milwaukee, used to drill stainless first bit lasted 8 holes. Milwaukee was trash over 2 ## 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 | #45,098 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #141 in Jobber Drill Bits | | Brand Name | Bosch | | Customer Reviews | 4.7 4.7 out of 5 stars (8,018) | | Cutting Angle String | 135 Degrees | | Cutting Diameter | 0.5 Inches | | 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 Type | Stainless Steel | | Model | CO21 | | Number of Flutes | 2 | | Point Style | Split Point | | 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 ![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 ### ⭐⭐⭐⭐⭐ Great product at a great price ! *by W***M on August 28, 2025* Great for hard metals, excellent product. ### ⭐⭐⭐⭐⭐ German Quality *by J***D on October 5, 2025* Superior to Milwaukee, used to drill stainless first bit lasted 8 holes. Milwaukee was trash over 2 ### ⭐⭐⭐⭐⭐ Works great *by S***R on December 15, 2025* Works great ## 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.co.th/products/46006807-co21-21-piece-assorted-set-with-included-case-cobalt-metal](https://www.desertcart.co.th/products/46006807-co21-21-piece-assorted-set-with-included-case-cobalt-metal) --- *Product available on Desertcart Thailand* *Store origin: TH* *Last updated: 2026-04-23*