#shorts Left-handed drill bits work in reverse, anti-clockwise. These drill bits are very useful for removing broken bolts and also stripped screws. A few years back I managed to buy a full set of these at auction for a bargain price. You don’t often see full sets of left-handed drill bits, these are made by a company called Wel-Bilt. These are certainly a welcome addition to my tool box, as I’ve removed many snapped bolts and stripped screws over the years!