The PTI HSS Tin Coated Step Drill 6.5 - 40.5mm is designed for precision drilling in a range of sizes within its diameter range. Ideal for working with thin materials, this step drill allows for progressive hole sizes with a smooth, chamfered finish. Size Range : 6.5 - 40.5mm, with increments: 6.5, 8.5, 10.5, 12.5, 16.5, 20.5, 25.5, 29, 32.5, 36.5, 40.5mm Material : High-speed steel (HSS), Tin coated Features : Self-starting with multiple hole sizes Provides a smooth, chamfered edge Ideal for drilling thin, rigid materials Brand : PTI