General description VersaDrive HSS-Cobalt Blacksmith Drill Bit 18mm is designed for exceptional performance in metal drilling. These long-life twist drill bits are suitable for use in any standard 1/2" drill chuck, making them versatile for cordless or pistol drills, as well as adaptable for Magnet Drills or Impact Wrenches. Technical specifications Diameter: 18mm Material: HSS-Cobalt with 8% Cobalt content Coating: GoldMax Low Friction Titanium Coating Point Type: 135 Split Point for easy starting Flute Design: Precision Ground with deep web for easy chip clearance Max Torque Recommendations for 10mm Steel: 4.2mm - 125Nm 5.0mm - 130Nm 5.5mm - 135Nm 6.0mm - 140Nm 6.5mm - 145Nm 6.8mm - 160Nm 7.0mm - 200Nm 7.5mm - 240Nm 8.0mm - 280Nm 8.5mm - 320Nm 9.0mm - 360Nm 9.5mm - 380Nm 10mm - 400Nm Installation To use the VersaDrive Drill Bits with an Impact Wrench, ensure that the impact mechanism does not engage while drilling. If it does, reduce the drilling pressure to avoid damaging the bit.