Features: HSS step drill bit offer multi size precisions drilling in wood, stainless steel, and sheet metal with durable high speed steel construction. Hex shank ensures secure grip in drills, while tapered cone design allows gradual hole enlargement and heat treated edges resist wear for extended durability. Ideal for professionals and DIY enthusiasts needing multifunction, long lasting tool for precise metalworking or wood projects. Perfect for creating clean holes in electrical installations, automotive repairs, or crafting projects requiring adjustable diameters. Quick assemble: 1/4"(6.35mm) hex shank work with most drill or drills with 1/4" chucks. Specifications: Material: High-speed steel Color: As pictures shown. Optional Step Size: 4-12mm, 4-20mm, 4-22mm, 4-32mm Size: As pictures shown. Quantity: 1pc Package Includes: 1pc Step Drill Bit note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.