Stamped and ink filled diameter markings for wear resistance. 6-Point design made with forged impact steel for durability. Non-slip hex geometry to prevent socket and fastener rounding. Lifetime Guarantee covers impact sockets and extensions only. Laser etched part number. Included in Standard and Deep: 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, and (1) 3″ Extension, (1) Universal Joint, and (1) 3/8″ Adapter. Impact resistant case with nestability for easy stacking and storage.