Snap-On SA12B is a 1/2-inch drive hex bit socket that accepts a 3/8-inch SAE Allen (hex) bit, letting a standard 1/2-inch drive ratchet turn 3/8-inch hex fasteners. Built for use with Snap-On's hex-bit socket line, it translates torque from your 1/2-inch drive into turning action on a 3/8-inch hex fastener. Ideal for automotive and machinery maintenance where 3/8-inch SAE hex fasteners appear, the SA12B provides a dedicated driver for quick, reliable bit-driven fastening.
