8pc screw extractor, damaged screw remover, extractor.
Removes broken screws,bolts and studs without damaging bolt or hole thre

size: Φ4.0-Φ4.5-Φ6.4-Φ7.6-Φ11-Φ15-Φ19-Φ24mm   / 1/8"-1/4",1/4"-5/16",5/16-7/16",7/16"-9/16",9/16"-3/4",3/4"-1",

application scope: 3-6mm,6-8mm,8-11mm  11-14mm,14-18mm,18-25mm,25-35mm  35-50mm.