High quality forging, forged from heat treated chrome vanadium steel, each socket surface treated with corrosion resistant black phosphoric acid to prevent oil and rust.Laser marking, each with a clear laser size mark, makes it quick and easy to select even in dim light.Customized storage boxes, each with a designated slot, so that the socket does not fall off easily. Sizes are also printed next to each card slot for easy identification.6-point socket design expands the contact surface between the socket and the fastener, increasing the locking force, reduces wear and prevents rounding off at cornersProduct Specification Includes:8Pcs SAE StandDard Sockets:5/16" 3/8" 7/16" 1/2" 9/16" 5/8" 11/16" 3/4"8Pcs SAE Deep Sockets:5/16" 3/8" 7/16" 1/2" 9/16" 5/8" 11/16" 3/4"14Pcs Metric Standard Sockets:8mm 9mm 10mm 11mm 12mm 13mm 14mm 15mm 16mm 17mm 18mm 19mm 21mm 22mm14Pcs Metric Deep Sockets:8mm 9mm 10mm 11mm 12mm 13mm 14mm 15mm 16mm 17mm 18mm 19mm 21mm 22mm2Pcs 3/8" Dr. Extension Bar: 3" 6"1Pc 1/2" Fto 3/8" M Reducer1Pc 3/8" Impact Universal Joint1Pc 3/8'' 65mm Hex Shank Socket Impact Adapter