Socket 1/2" Drive 12pt Metric - 21mm

12-point bi-hex socket for fast, accurate location to the fastener. Precision cold-forged, hardened and tempered chrome vanadium steel. Fully polished and nickel chrome plated for durable corrosion resistance. Chamfered ends and thin walls for positive location on fastener. Knurled ring provides grip and control in the hand, and bearing hole provides solid connection to the tool.