The Black Diamond 20 PC Ratcheting Wrench Set covers both metric and SAE fasteners in one ready-to-work kit, with metric sizes 6mm, 8mm, 10mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, and 18mm plus SAE sizes 1/4, 5/16, 11/32, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, and 3/4. Made from chrome vanadium steel for dependable strength and durability, each wrench is built for everyday service, repair, and maintenance tasks. A 72-tooth gear system delivers smooth ratcheting with minimal swing, helping you work more efficiently in tight spaces while keeping solid control on the fastener.