GEARWRENCH 84916N SAE/Metric 3/8" Drive Impact Socket Set (44 Piece) Impact Sockets built from chrome molybdenum alloy steel (CR-MO) for exceptional strength and durability Off-corner loading design reduces fastener rounding Black phosphate corrosion-resistant coating laser etched with high-visibility markings and hard stamped with size labels Deep 6-point sockets with chamfered openings and an attachment port compatible with traditional ratchets Parallel neck down design on 8mm, 9mm, 10mm, and 11mm sockets allow improved access around restricted fasteners Meets or exceeds ASME B107.2 specifications for proven strength Available in standard and deep styles in 1/4&#034;, 3/8&#034;, 1/2&#034;, 3/4&#034;, &amp; 1&#034; drives. Parallel neck down feature on 3/8&#034; and 1/2&#034; drive to increase access to restricted fasteners.