This 10 Piece 1/2" Drive 8 Point Socket Set by Armstrong incorporates a radius corner design that engages the flats of the fasteners, not the corners, providing up to 15% - 20% more torque while reducing fastener rounding and enhancing the turning of worn fasteners. EYE-D™ markings optimize size visibility while also providing SAE / Metric differentiation. A Unique socket retention method, cold form ball recess, provides consistent secure retention of the socket to the drive tool eliminating the possibility of either a loose fit or tight fit. The socket wall dimensions are optimized to provide strength while retaining access to restricted fasteners. Manufactured from high alloy steel using the most up-to-date manufacturing process and heat treat for greater strength and durability. Meets or exceeds ASME B107.1-2002 and US Federal GGG-W-641E specifications.