Manufactured from chrome vanadium steel with a bright chromed finish. These sockets are designed to drive the hexagon flats, not the corners. This enables one socket to drive metric, imperial A/F, Whitworth and BS/BSF hex. head nuts/bolts. Fits metric and imperial, A/F hexagons and the majority of BSF and Whitworth Efficiently turns old, worn rounded hexagons and protects new ones Fast selection, fewer sockets needed
