SCREW EXTRACTOR SPIRAL FLUTE 5PC SET NO1 NO2 NO3 NO4 AND NO5 - 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.