TEKTON SID92105 1/2 in. Drive Deep 6-Point Impact Socket Set (31-Piece) (8-38 mm) with RailsTEKTON impact sockets have both a high-visibility laser marking and a permanent stamped marking that wont wear off. Theyre designed for use with both friction ring anvils and detent pin anvils. Precise 6-point openings provide an exact fit for hex fasteners. Each socket size meets a minimum of 1.3 times the ANSI/ASME standard for proof torque.Sizes are marked both with a high-visibility laser marking and a permanent stamped marking that wont wear off6-point socket openings provide an exact fit for hex fastenersRadiused corners prevent fastener round-off by applying force to a fasteners flat sides, rather than its cornersMeets a minimum of 1.3 times the ANSI/ASME standard for proof torqueTwist-to-lock socket rail organizes and securely holds sockets in place, both for in your toolbox and on the go31-piece 1/2 in. drive deep 6-point impact sockets: 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38 mmSocket rails and trayDimensionsDrive Size1/2 in