The Cornwell Tools 15-pc 3/8" Drive Bolt Extractor Set, No. CTGBE15ST, is designed to provide greater surface control for less chance of slipping and less chance of damaging bolt, the company says. The set may be used to remove broken bolts or replace new bolts. The size range includes: 1/4", 3/8", 7/16" (11mm), 1/2", 9/16", 5/8" (16mm), 11/16", 3/4" (19mm), 8mm (5/16"), 10mm, 12mm, 13mm, 14mm, and 17mm. The set also includes a punch bar.