Feature 1Adopts high quality chromemolybdenum steel material, with rustproof and anticorrosion properties, durable to use. 2Hardening treatment improves the rotation power and reduces wear, ensures high working efficiency. 3Carefully manufactured and designed, bit with precise chamfer can ensure smooth inserting. 4Socket screwdriver bit with increased torsion and impeccable hardness, suitable for any 1/2in air impact/power bar. 5The printed size information on the socket can helps you get a quick recognition.Item Type: Socket Screwdriver Bit SetMaterial: Chrome-Molybdenum SteelColor: BlackTotal Height: Approx. 78mm/3.1inBit Diagonal Size:H5 : Approx. 5mm/0.20inH6 : Approx. 6mm/0.24inH7 : Approx. 7mm/0.28inH8 : Approx. 8mm/0.31inH10: Approx. 10mm/0.39inH12: Approx. 12mm/0.47inH14: Approx. 14mm/0.55inH16: Approx. 16mm/0.63inH17: Approx. 17mm/0.67inH19: Approx. 19mm/0.74inSquareSocket Interface Size: Approx. 1/2inApplication:Suitable for any air impact/power bar, etc. with 1/2insquaredrive interfaceRepair tool for home, automobile, etc. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List10 xScrewdriver Bit1 x Blue Tool BoxNotePlease allow 02mm error due to manual measurement. Thanks for your understanding.