The PTI 6-30mm HSS Tin Coated Step Drill is designed for drilling a range of hole sizes in thin materials such as sheet metal. Each step of this drill creates progressively larger holes, making it ideal for precision work on rigid materials. Size Range : 6.0 - 30mm in 2mm increments Material : High-speed steel (HSS), Tin coated Shank Type : 1/4" Hex Drive Applications : Suitable for drilling thin materials up to 6.5mm thick, such as sheet metal Features : Self-starting with multiple hole sizes Provides a chamfered edge to the hole Ideal for making progressively larger holes without twisting Brand : PTI