3/8"Drive Impact Socket Set, 48 Piece Standard SAE and Metric Sizes (5/16-Inch to 3/4-Inch and 8-22 mm), 6 Point, Cr-V Steel Socket Set About this itemMade from drop forged and heat treated Chrome Vanadium Steel (50BV30) with a corrosion-resistant black phosphate finish, providing the durability for a hard use.High-contrast 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. Set includes: 3" and 6" drive impact extension bars, 3/8" universal joint, 1/2" to 3/8" reducer， 1/4"-3/8"drill adapter, socket sizes: SAE Sizes, Deep: 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4 (inches), Shallow: 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4 (inches); Metric Sizes: Deep: 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,21, 22mm, Shallow: 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22mm. Heavy duty plastic blow-molded carrying case for easy transport and organization.Meets or exceeds ANSI performance standards.