1.Description of 5pcs HSS 4241 Step Drill Bit Set For Drilling Metal 
Dimensions: 5 Pcs step drill bits enable 50 sizes - each step drill bit can drill several bore diameters. It can work as 50 pcs twist drill bits. You don't have to replace drill bit constantly with the step drill bits. Automatic Center Punch - the center punch delivers an automatic, high-impact, spring-loaded strike-through adjusting the cap; it has a deeply knurled surface for nonslip control. Titanium High-Speed Steel: classic high-speed steel with titanium coating for proven capability and durability in drilling holes in plastic, aluminum, copper, and many other types of metal sheet. Double Cutting Side & Three-Side Shank - Double cutting side and X-type openings design ensures a faster and smoother cutting; 3-sided shank design prevents slip in drill chuck can cut through the wood, sheet metal, steel, and other surfaces. What You Get - HYCLAT Step Drill, Automatic Center Punch, Aluminum Case, 24 months warranty - Ideal Gift for Father's Day, Perfect for DIY lover.

2. Features of 5pcs HSS 4241 Step Drill Bit Set For Drilling Metal