TEKTON 3/8 Inch Drive x 21 mm 6-Point Impact Socket | SID12121

Size is marked both with a high-visibility laser marking and a permanent stamped marking that won't wear off 6-point socket opening provides an exact fit for hex fasteners Radiused corners prevent fastener round-off by applying force to a fastener's flat sides, rather than its corners Meets a minimum of 1.3 times the ANSI/ASME standard for proof torque Detent pin hole on one side allows user to choose whether to engage a pin