Screw Extractor Drill Bits Pack of 4 Removal of damaged screws, bolts and studs. For removal of screws and fixings 3 - 12mm. Manufactured from M2 steel. Product features a reverse thread. Use drill bit end with drill in reverse to create a hole in damaged screw. Operate drill slowly in reverse to bite and remove screw. Complete with storage case. For other hand tools please visit our shop. Sizes Extractor 1: Removes diameter 3 - 5mm. Extractor 2: Removes diameter 4 - 8mm. Extractor 3: Removes diameter 5 - 10mm. Extractor 4: Removes diameter 6 - 12mm.