Armstrong 44-546 1/2-Inch Drive 6 Point Metric Socket Set with Plastic Socket Rail, 15-Piece Thin wall design with precise fastener end dimensions meet industrial specifications Radius corner design provides 15-20% 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