8-piece heavy duty steel extractordifferent sizes of screw extractor to meet different needs.Screw extractor size includes 1 for 1/8"-5/32" , 2 for 5/32"-3/16", 3 for 3/16"/4", 4 for 1/4"-5/16", 5 for 5/16"-7/16", 6 for 7/16"-9/16", 7 for9/16"-3/4", 8 for 3/4"" .Remove Damaged Screws Bolts And Water Pipes - These extractors will remove most kinds of damaged, stripped, rusted, broken, or stuck screws from any wood or metal surface with relative ease. The new two water pipe extractors, designed for the broken water pipes.It can remove some of the common screwdriver can not be disassembled damaged bolts, screws, bolts and pipes.Reverse thread bits easily remove screws, bolts, studs, and threaded pipe fittings.