Century Drill & Tool 73307 Spiral Flute Screw Extractor, #7Screw extractors are used when a screw or bolt has broken off while still in the fastening hole. Ideal for thin wall extractions. Highlights: Size: #7 Material: Alloy Steel Removes bolt or screw size 7 8 inch 1 1 8 inch Removes pipe 1 2 inch Use drill bit size 17 32 inch, suggested left hand cobalt drill bits WARNING: This product and the dust created by its use may contain chemicals including lead known to the State of California to cause cancer