The 30 Piece Combination Impact Socket Set offers a wide variety of sockets for any user need. These sockets have DirectTorque technology to help prevent rounding of fasteners and provide better grip.Features Heat treated CR-440 steel O-ring and retaining pin compatible High visibility laser etched markings DirectTorque Technology Black oxide coating Includes(1) 1/2 in. Drive 6 pt Impact Sockets: Metric 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24 | (1) 1/2 in. Drive 6 pt Deep Impact Sockets: Metric 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24 | (1) 1/2 in. Drive Impact Socket Extension 2 in. | (1) 1/2 in. Drive Impact Universal Joint Drive Size: 1/2 in Impact Or Standard: Impact Weight: 14.345 lbs Length: 15.500 in Width: 11.500 in Height: 3.500 in Material: Steel, Heat treated CR-440 steel Product Finish: Black Oxide Coating Deep Sockets Included: Yes Etched Or Stamped: Yes Unit Of Measure: SAE & Metric Country of Origin: Taiwan