Mastercraft Extract-it Set. Made with chromium steel. Unique internal spiral design grips nuts/bolts for quick & easy removal of rounded, damaged or rusted fasteners. 5 piece set includes: 3/8", 7/16 (11mm), 1/2", 9/16 (14mm), 5/8 (16mm). Comes in a handy carry case. All are in like-new condition. $15