Exceptional toughness and long life Made for heavy use: the step drill is built to resist breaking and wear better than ordinary drills. Cobaltcoated speed steel (HSS) construction reduces friction and extends tool life. Precise, controlled hole cutting Hex shank design fits securely in standard drill chucks for stable, wobble operation. Step geometry lets you drill multiple hole diameters with one bit while maintaining clean, accurate edges. Seven size options to cover many tasks Available sizes: 312 mm, 412 mm, 420 mm, 422 mm, 624 mm, 432 mm, and 635 mm. Choose the size range that matches your application to avoid changing bits and to speed up work. Wide material compatibility Suitable for 304 stainless steel, wood, thin iron, aluminum alloy, PVC plate, and other similar materials. Cobalt coating helps when working on harder metals and reduces heat buildup. Practical use scenarios Electrical and plumbing installations: open clean, sized holes in metal panels, junction boxes, and PVC plates for conduit, fittings, and grommets without switching bits. HVAC and sheet metal work: quickly enlarge knockouts or create mounting holes in thin iron and aluminum panels while keeping edges smooth. Workshop and DIY projects: drill stepped holes in wood, plastic, and softer alloys for fittings, cable passthroughs, or fabrication tasks. Why Reduces bit changes and speeds repetitive work by offering multiple diameters in one tool. Durable HSS material with cobalt coating delivers better resistance to chipping and wear than standard bits. Hex shank ensures secure grip and consistent drilling performance across materials listed. Specifications recap Material: speed steel (HSS) with cobalt coating Shank type: Hex Size options: 312, 412, 420, 422, 624, 432, 635 (mm) Suitable for: 304 stainless steel, wood, thin iron, aluminum alloy, PVC plate, and similar materials Tips for results Use appropriate drill speed for the material: slower speeds for harder metals, higher speeds for plastics and wood. Apply steady, even pressure; use cutting lubricant when drilling stainless steel to reduce heat and prolong life. Start with a pilot point if precise center location is critical.