High-quality cobalt step drill bit set — 3pcs (1141) Durable cobalt construction: Manufactured from high-quality cobalt for excellent hardness and long-lasting wear resistance. Built to hold edge and perform consistently under heavy metalworking use. Precise cutting with hex straight groove design: The hex straight groove profile provides secure grip and stable cutting action for controlled, accurate hole formation across multiple step diameters. Reduced heat and friction: Each bit features a coated milling cutter surface that lowers friction and heat buildup during drilling, improving cut quality and extending tool life. Designed for metal core hole opening: Optimized for creating clean, accurate holes in metal materials, making step drilling faster and more reliable than standard twist bits. Pack of 3 (1141) for value and readiness: Three bits in one set supply several step sizes for common tasks and reduce downtime by keeping spare cutters on hand. Key benefits — why you need this set Faster, cleaner holes: Step geometry and coating reduce burrs and rework compared with basic bits, saving time on finish work. Longer tool life under heavy use: Cobalt material plus coating resists wear and overheating, so the bits remain sharp through repeated metal drilling. Versatile for metalworking projects: One compact set covers a range of hole sizes so you can switch steps instead of swapping many individual bits. Typical applications Electrical and control panel work: Open clean knockout and cable-entry holes in electrical enclosures and metal panels. HVAC and ducting: Create precise holes in sheet metal for fittings, fasteners, and duct transitions. Automotive and metal repair: Drill accurate stepped holes in body panels, brackets, and thin structural metal components. What’s included Three step drill bits, model 1141 (3pcs), providing multiple step diameters for core hole opening in metal and general metalworking tasks. Notes Ideal for metal materials and a variety of metalworking tasks. Follow proper drilling speeds and lubrication practices for best results and longest tool life.