Socket 1/4" Drive 6pt Metric - 5.5mm

6-point hex socket for maximum torque transfer to the face of 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 gives grip and control, and bearing hole provides solid connection to the tool.