Armstrong 12-144 1-3/8-Inch, 12 Point, 1/2-Inch Drive SAE Standard 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 Proudly manufactured in the USA Lifetime Warranty