SCREW EXTRACTOR SPIRAL FLUTE NO2 - SPIRAL FLUTE SCREW EXTRACTORS. SCREW EXTRACTORS ARE USED WHEN A SCREW OR BOLT HAS BROKEN OFF WHILE STILL IN THE FASTENING HOLE. AGGRESSIVELY REMOVES SCREWS OR BOLTS. USE COBALT DRILL IF BROKEN OFF USE WITH CUTTING OIL TO KEEP COOL.