--- product_id: 537744825 title: "5% Cobalt Drill Bit Set (1/16-3/8 Inch, 21PCS) for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood, M35 Hss Heavy Duty Twist Steel Drill Bits Index." brand: "stroton" price: "₱5259" currency: PHP in_stock: true reviews_count: 13 category: "Stroton" url: https://www.desertcart.ph/products/537744825-5-cobalt-drill-bit-set-1-16-3-8-inch store_origin: PH region: Philippines --- # 21 precision sizes from 1/16 to 3/8 inch 68 HRC hardness for heat resistance 5% Cobalt Steel for 3X durability 5% Cobalt Drill Bit Set (1/16-3/8 Inch, 21PCS) for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood, M35 Hss Heavy Duty Twist Steel Drill Bits Index. **Brand:** stroton **Price:** ₱5259 **Availability:** ✅ In Stock ## Summary > 🔩 Drill Smarter, Last Longer — Own the Toughest Jobs with STROTON! ## Quick Answers - **What is this?** 5% Cobalt Drill Bit Set (1/16-3/8 Inch, 21PCS) for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood, M35 Hss Heavy Duty Twist Steel Drill Bits Index. by stroton - **How much does it cost?** ₱5259 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ph](https://www.desertcart.ph/products/537744825-5-cobalt-drill-bit-set-1-16-3-8-inch) ## Best For - stroton enthusiasts ## Why This Product - Trusted stroton brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Heavy-Duty Storage:** Durable Q235 cold-rolled steel case keeps your bits organized and ready for action. - • **Unmatched Longevity:** 5% cobalt steel boosts tool life and wear resistance by 3X, saving you money and downtime. - • **Versatile Size Range:** 21 drill bits in 1/64 inch increments cover every project from delicate plastics to tough cast iron. - • **Precision Split Point:** 135° split point design ensures effortless, accurate starts on stainless steel and hard metals. - • **Speed Meets Efficiency:** Run drills 3X faster with superior heat dissipation—cut more holes with less wear. ## Overview The STROTON 5% Cobalt Drill Bit Set features 21 industrial-grade M35 HSS bits with 68 HRC hardness and a 135° split point for precision drilling in stainless steel, hard metals, wood, and plastic. Engineered for 3X longer life and faster drilling speeds, this set comes in a rugged cold-rolled steel case, making it the ultimate choice for professionals demanding durability and versatility. ## Description Product description Why Choose Premium STROTON Cobalt Drill Bits? Researches have shown that compared with HSS without cobalt, HSS with cobalt has higher temperature resistance, red hardness, wear resistance and heat treatment response. Red hardness, which means that the drill bits hardened steel can maintain hard at 860-880℃ . 68 HRC,it means that the drill bits has 3X cutting ability and 3X durability. This drill bits set is made of True Premium Cobalt (80,000 dollars per ton). Truly Made of 5% Cobalt Alloy Steel This drill bits set definitely have more cobalt in them than the "Cobalt" bits that HF sells--which are just Cobalt coated or only a tiny amount of cobalt tipped. Compared with ordinary high speed steel, 5% cobalt provides better heat and wear resistance,and Hold up Better. 3X Drilling Efficiency + 3X Tool Life Split Point design tip starts drilling immediately with less force and eliminates "walking" across the work surface. Ideal for Stainless steel,Mild Steel,Iron,Hardmetal,Aluminum,Copper,Plastic and Hardwood. The drill bit can be used for mechanical maintenance, such as drilling out bolts and screws. Be vertical to the workpiece Non-vertical use may cause the drill bit to break. Using a drill press with sufficient power will make drilling easier. Low speed: 200 to 1000 RPM Too high speed may burn the bit tip. Drill diameter≤3/16，RPM（1000~700） 3/16-3/8，RPM（700~350） 3/8-1/2，RPM（350~200） Use cutting fluid Add stainless steel tapping oil or engine oil to prevent the stainless steel from overheating. It also works adding some vinegar,soy sauce or water. Remain steady and patient The drilling shall be started slowly by applying force slowly and gently until the drill bit starts chipping. STROTON Ture Cobalt Steel Products for Stainless Steel, Hard Metal, and Wood. 1/16-3/8 Inch (21PCS) 1/16-1/4 Inch (13PCS) 1/16-1/2 Inch (17PCS) 1mm-10mm (19PCS) 4mm-32mm (15 Steps) Metric Drill Bits Review: Thumbs up. - Had them for over a year and soon to buy another set. For the price I didn’t have high expectations, but it turns out these cut and hold up incredibly well. Great stuff. Don’t forget to order a bottle of tap magic ;) Review: Quality Tools - Great Quality. Great Value. ## Features - 【Premium 5% Cobalt Steel with 68 HRC】 This Fully Ground Cobalt Drill Bits Set are Made with 5% Ture Cobalt. Although the Cost and Price are Slightly Higher, With a Useful Life,Heat,Wear and Chip Resistance up to 3 Times Longer than the Average Product. - 【3X Efficiency + 3X Tool Life】This Cobalt HSS Drill Bits Set is Typically Capable of Running 3 Times Faster. Despite the Higher Price,the Cost Per Hole When Using Cobalt Drill Bit Will be the Lowest,Since It Can Produce So Many More Holes. - 【Split Point Design with Unparalleled Precision】This Heavy Duty Work Drill Bits Kit is Suitable for Steel, Stainless Steel, Cold Rolled Steel, Hard Metals, Aluminum Alloy, Hard Wood, and Plastic, and Drilling Out Bolts Studs and Screws. - 【Sturdy and Durable Metal Case】Different from the General Metal Case, This Drill Bits Case is Made of Q235 Cold Rolled Steel Plate, which Can be Opened and Closed Smoothly to Take the Drill Bits out at Any Time. - 【21 Pieces Jobber Length Industrial Drill Bits Includes】: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, 23/64, 3/8 [DIA 1/64 Inch Increments] ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0C46XBQYB | | Best Sellers Rank | #175,653 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #350 in Jobber Drill Bits | | Brand | STROTON | | Brand Name | STROTON | | Customer Reviews | 4.5 out of 5 stars 249 Reviews | | Cutting Angle String | 135 Degrees | | Cutting Diameter | 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, 23/64, 3/8 Inches Cutting Diameter 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, 23/64, 3/8 Inches See more | | Finish Type | Uncoated | | Finish Types | Uncoated | | Item Weight | 1 Pounds | | Manufacturer | STROTON Ltd | | Material | Cobalt , Cobalt Steel, High Speed Steel (HSS) | | Material Type | Cobalt, Cobalt Steel, High Speed Steel (HSS) | | Minimum Bore Diameter | 0.38 Inches | | Number of Flutes | 2 | | Number of Pieces | 21 | | Part Number | M35 Co5 1/16"-3/8" (21PCS) | | Point Style | Split Point | | Set Name | STROTON 5% Cobalt Drill Bit Set | | Shank Type | (1/16-11/64: Round Shank) (3/16-3/8: 3-Flat Shank) | | Surface Recommendation | Metal,Stainless,Steel | | Tool Flute Type | Spiral | | UPC | 673498823361 | | Unit Count | 1.0 Count | ## Product Details - **Cutting Angle String:** 135 Degrees - **Finish Type:** Uncoated - **Material:** Cobalt, Cobalt Steel, High Speed Steel (HSS) - **Shank Type:** (1/16-11/64: Round Shank) (3/16-3/8: 3-Flat Shank) ## Images ![5% Cobalt Drill Bit Set (1/16-3/8 Inch, 21PCS) for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood, M35 Hss Heavy Duty Twist Steel Drill Bits Index. - Image 1](https://m.media-amazon.com/images/I/71U6DoKVOSL.jpg) ![5% Cobalt Drill Bit Set (1/16-3/8 Inch, 21PCS) for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood, M35 Hss Heavy Duty Twist Steel Drill Bits Index. - Image 2](https://m.media-amazon.com/images/I/71e5q0G7eQL.jpg) ![5% Cobalt Drill Bit Set (1/16-3/8 Inch, 21PCS) for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood, M35 Hss Heavy Duty Twist Steel Drill Bits Index. - Image 3](https://m.media-amazon.com/images/I/7177l84LB4L.jpg) ![5% Cobalt Drill Bit Set (1/16-3/8 Inch, 21PCS) for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood, M35 Hss Heavy Duty Twist Steel Drill Bits Index. - Image 4](https://m.media-amazon.com/images/I/81DFSJVF1wL.jpg) ![5% Cobalt Drill Bit Set (1/16-3/8 Inch, 21PCS) for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood, M35 Hss Heavy Duty Twist Steel Drill Bits Index. - Image 5](https://m.media-amazon.com/images/I/81eEQxE3VFL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Thumbs up. *by N***Y on December 27, 2025* Had them for over a year and soon to buy another set. For the price I didn’t have high expectations, but it turns out these cut and hold up incredibly well. Great stuff. Don’t forget to order a bottle of tap magic ;) ### ⭐⭐⭐⭐⭐ Quality Tools *by J***L on March 23, 2026* Great Quality. Great Value. ### ⭐⭐⭐⭐⭐ Stays sharp *by E***R on March 28, 2026* Working great ## Frequently Bought Together - STROTON 5% Cobalt Drill Bit Set (1/16-3/8 Inch, 21PCS) for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood, M35 Hss Heavy Duty Twist Steel Drill Bits Index. - STROTON Cobalt Drill Bit Set (1/16-1/2 Inch, 17PCS), M35 High Speed Steel Twist Drill Bits for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood - 5/16-Inch Cobalt Steel M35 Jobber Length Twist Drill Bits for Hard Metal, Stainless Steel, Pack of 6 --- ## 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.ph/products/537744825-5-cobalt-drill-bit-set-1-16-3-8-inch](https://www.desertcart.ph/products/537744825-5-cobalt-drill-bit-set-1-16-3-8-inch) --- *Product available on Desertcart Philippines* *Store origin: PH* *Last updated: 2026-05-29*