Package includes Step Drill Bits Set with 3 precision sizes: 412 mm, 420 mm, and 432 mm. Comes with a portable fabric storage bag to keep tools organized on job sites, in the workshop, or during DIY projects. material Titaniumcoated speed steel (HSS) construction delivers faster, smoother drilling through hard steel, aluminum, copper, and stainless steel sheets. The coating resists wear and helps maintain sharpness for repeated use. Easy to use Hex shank fits most drills and drill chucks with no adapters needed. Functions as hole cutter drill bits and is suitable for both DIY beginners and professional applications in plumbing or metalwork. Designed for precision Step cone drill bits create accurate holes at speed, reducing material waste. Ideal for drilling into sheet metal, stainless steel, or other tough materials. Compatible with hole saw sets and precision metal fabrication tasks. Key specifications and compatibility Sizes: 412 mm, 420 mm, 432 mm Material: Titaniumcoated speed steel (HSS) Shank: Hex Includes: Portable fabric storage bag Typical use scenarios In a metal fabrication , drill precise holes in sheet metal panels or brackets for assemblies. During plumbing or HVAC installations, create clean, accurate holes in copper or stainless steel components. For DIY projects in a home workshop, prepare metal parts and fit components that require reliable hole quality and repeatable results.