#3 Sq Screw Extractor

#3 square flute screw extractor. Removes bolt or screw size 7/16". Removes pipe 1/8". Use drill size 15/64", left hand cobalt drill bit suggested. Screw extractors are used when a screw or bolt has broken off while still in the fastening hole. Ideal for thin wall extractions. Will not spread the wall as it extracts.