14step sizes: 4mm, 6mm, 9mm, 12mm, 15mm, 18mm, 21mm, 24mm, 27mm, 30mm, 33mm, 36mm, 39mm, 42mm Ideal for cutting precision holes in metal and other materials Key benefits Wide size range in a single tool: 14 steps from 4mm to 42mm cover a broad range of hole sizes without changing bits. Time saving and efficiency: reduces the need to switch tools mid project, helping you complete tasks faster. Consistent hole diameters: designed to produce accurate, steadily enlarging holes for precise fits. Versatile material compatibility: suitable for metal and other materials, enabling use across multiple projects. What it is A stepped drill bit providing multiple diameter options in one instrument, designed for cutting precision holes in metal and other materials. Use scenarios Electrical installations and panel work: create holes for cables, conduits, or fittings in metal enclosures and brackets with a single bit. Metal fabrication and sheet metal work: drill clean, correctly sized holes in plates, brackets, and thin sheets to simplify assembly. DIY and projects: handle various hole size requirements for projects involving metal, plastic, or other compatible materials with one versatile tool. Specifications and performance Size range: 4mm to 42mm across 14 stepped diameters. Function: drills precision holes in metal and other materials using a single stepped bit to cover multiple sizes.