Superior Performance Made from premium CrV steel for superior impact performance, these 6-point, high-torque sockets grip the stronger flat sides of fastener head, not the weaker corners, preventing stripping or round-off under stress. Easy-to-Read Sizes Extra large, high-contrast size markings are permanently laser etched onto each socket, making it easy to see and select the right size, even in low light. Metal Storage Case Tough metal case keeps everything organized for neat, efficient storage. Designed for use with impact wrenches High-torque, 6-point sockets grip flat sides of fasteners, not corners, preventing round-off 10-pc. 1 in. drive sockets SAE 7/8, 1", 1 1/8", 1 1/4", 1 3/8", 1 1/2", 1 5/8", 1 3/4", 1 7/8", 2"