Alpha Left Hand Drill Bit for the removal of damaged bolts studs and screws Features / Benefits: Ideal for Stainless Steel and Hi-Tensile Steel Fully ground HSS Cobalt increases strength and drill life Improves heat resistance for increased strength and drill life 135 Deg Split Point cuts faster and reduces wandering Directions for use: 1. If possible grind or flatten the head of the damaged bolt or screw. 2. Use a heavy hammer and centre punch to mark the centre of the bolt or screw. This will prevent the drill from wandering. 3. Drill into the bolt or screw in reverse using a small size left-hand drill with a variable speed reversible drill. 4. If the bolt does not reverse out use the small hole as a pilot hole and change to a larger size left-hand drill. Most bolts come out before the hole drilling operation is finished. 5. The drill will grab the bolt when breaking through the backside. Typically this is the stage when the broken fastener will spin out of the threaded hole. When drilling through the broken bolt vibration will help to break the bolt free. All material is advisory only and its use by anyone is entirely voluntary. Reliance on it for any purpose by anyone is at the sole risk of that person and Bolt and Nut Australia is not responsible for any loss claim or damages arising therefrom.