Armstrong 20-420 1/2-Inch Drive 8 Point 5/8-Inch Impact Socket Thin wall design with precise fastener end dimensions meet industrial specifications Radius corner design provides 15-20-Percent more torque which extends fastener life and reduces slippage Large EYE-D size markings ease identification and provide SAE/Metric differentiation Lifetime Warranty Proudly made in the USA with a lifetime warranty