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″