Dremel's line of Max Life high-performance accessories provide long-lasting performance and impressive durability. Built to give you longer lasting, stronger performing, versatile accessories. The Max Life 629HP Step Drill Bit's stepped design allows you to drill 4 progressively sized holes, 1/16" (1.6mm), 1/8" (3.2mm), 3/16" (4.8mm), and 1/4" (6.6mm) in a single pass without swapping accessories, 4X faster than changing between individual drill bits. Coated in titanium nitride and engineered for long-lasting, precise drilling performance. Ideal for creating countersunk holes and precision drilling in plastic, wood, soft metal, and drywall. Pairs great with the Dremel 220 Workstation. Compatible with the standard Dremel 480 1/8" collet, 220 Workstation, and 4486 Keyless Chuck. One bit included per package.