Sizes: #1, #2, #3, #4, & #5, 1/8"-3/4" width High Carbon Alloy Tempered Steel, Multi-Fluted Hardened for long life Extract a wide variety of screws, easy to use Reverse Thread, locks on and backs out broken studs #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"