TEKTON 14174 3/8-Inch Drive by 18 mm Shallow Socket, Cr-V, 12-Point 12-point opening smoothly slides onto hex-shaped fastener heads at twice as many angle positions as 6-point sockets Advanced design shifts contact away from corners onto flat sides to reduce the chances of round off Shallow well and slim walls allow socket to fit into tight, narrow spaces Detent notches in drive end lock onto ratchets and extensions Made from premium chrome vanadium steel with a durable mirror chrome plated finish