Details:- Repairs damaged threads without undercutting good threads.- For quick repairs of damaged threads on bolts and studs.- Sizes: 1/4″-28, 5/16″-24, 3/8″-24, 7/16″-20, 1/2″-20, 9/16″-18, 5/8″-18 – Packed in a reusable clamshell package