Dewalt, 23 piece, 1/2" drive, impact socket set, set includes: (20) 1/2" drive 6 point impact sockets: 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1", 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 21mm, 22mm, 24mm, (1) 1/2" drive 5" impact extension, (1) 1/2" drive drill adapter, (1) 1/2" drive quick release ratchet, the sockets include directtorque technology to help prevent rounding of fasteners & to provide better grip.