6-point hex socket for maximum torque transfer to the face of the fastener Precision cold-forged, hardened & tempered chrome vanadium steel Fully polished & nickel chrome-plated for durable corrosion resistance Chamfered ends & thin walls for positive location on fastener Contents: 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19 & 21mm
