Sizes: #1) 1/8"-1/4", #2) 1/4"- 5/16", #3) 5/16"-7/16" #4) 7/16"-9/16" #5) 9/16"-3/4".

High Carbon Alloy Tempered Steel, Multi-Fluted

Extract a wide variety of screws, easy to use

Hardened for long life, Reverse Thread, locks on and backs out broken studs