The PTI HSS Tin-Coated Step Drill 6 - 20mm offers a practical solution for drilling a variety of hole sizes with a single bit. Ideal for working with thin materials such as sheet metal up to 6.5mm thick, this step drill provides precise and progressive cutting. Size Range : 6.0 - 20mm, with increments: 6.0, 8.0, 10.0, 12.0, 14.0, 16.0, 18.0, 20mm Material : High-speed steel (HSS), Tin coated Shank Type : 1/4” Hex Drive Features : Self-starting with multiple hole sizes Ideal for thin, rigid materials such as sheet metal Provides a chamfered edge and smooth finish Brand : PTI