HMT 505020-SET1 VersaDrive Step Drill Bit Set 12-30mm The HMT 505020-SET1 contains 3 Step Drills in sizes: 4-12mm, 4-22mm and 4-30mm. A handy set case of Impact-rated HMT Versadrive Step drills with Spiral flute design for fast, smooth drilling with a rotary drill or impact wrench. The first step drill optimised for use with impact wrenches & impact drivers allowing the user to create holes in seconds. Featuring a spiral flute design with self-starting drill tip, for fast, smooth drilling with a rotary drill or impact wrench and market leading 5mm thick drilling capacity. VersaDrive Step Drills have a patented non-slip, Hex shank suitable for use in any standard 1/2 drill chuck for cordless or pistol drills or used with a VersaDrive Rapid Lock adapter for use in a wide range of powertools such as Magnetic Drills. Features: Market Leading 5mm thick drilling capacity Fast, smooth drilling with minimal kickback Specially hardened for impact wrench use. Precision ground flutes with easy chip clearance 135° split point angle for easy starting & accuracy GoldMax low-friction titanium coating to stop burn out High strength, non-slip shank design 3 pc set in kit case For fastest performance use on impact wrenches & impact drivers Excellent life and performance when used with rotary pistol drills or drill presses Suitable for stainless and harder materials if used at low RPM Use appropriate lubrication and correct RPM to achieve long tool life Specification: HMT 505020-0120 - Diameter: 4, 6, 8, 10 and 12mm HMT 505020-0220 - Diameter: 4, 6, 8, 10, 12, 14, 16, 18, 20 and 22mm HMT 505020-0300 - Diameter: 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28 and 30mm