Specifications Material: High Speed Steel Features 1. Two-fluted design can provide a faster cutting and easy rings reading to keep the drill bit clean, while the three-sided shank design will effectively prevent drill bits from slipping. 2. High speed steel enhanced with the titanium coating ensures outstanding durability to stay sharp and shiny for years to come. 3. Totally 5pcs step drill bits can easily cut through most sheet metal, aluminum sheets, wood board, plastic board, and some other materials with ease(the board must be smaller in thickness than the height of step drill bits). Package Included: 5* Step Drill Bits On Nov-21-20 at 17:26:05 PST, seller added the following information: