Key benefits Replace several drill bits with a single, space-saving step drill that cuts hole sizes from 4 mm to 20 mm — fewer tool changes, faster work. Made from high-speed steel for high hardness and good wear resistance, delivering reliable, long-term performance. Coated surface gives an attractive gold finish that resists fading and protects the cutter surface during use. Hex shank design ensures a secure grip in hex chucks and quick-change holders for stable, slip-free drilling. Main features Material: high-speed steel (HSS) for durability and wear resistance. Finish: coated gold-colored surface, resistant to fading. Size range: drills hole diameters from 4 mm up to 20 mm in stepped increments. Shank: hexagonal grip for stable mounting and easy bit changes. How it solves problems Eliminates multiple bit swaps when creating progressively larger holes, saving time and reducing interruptions. Durable HSS construction and protective coating reduce wear and extend useful life, lowering replacement costs. Hex shank minimizes slipping and wobble, improving accuracy on repeat holes. Applications and use scenarios Electrical installation: quickly create knockout holes for switches, outlets and conduit in panels and junction boxes. Metalworking and HVAC: drill stepped openings in thin sheet metal for grommets, vents or cable pass-throughs. General DIY and woodworking: enlarge holes for fittings, bushings or cable routing without changing bits. Practical notes Single-step solution for a range of hole sizes (4–20 mm). Designed for many common work situations where progressive hole sizing and reliable performance are needed. Use with drills that accept hex shanks and quick-change holders for best results.