About Our Products： Professional Quality 9pc 1/2″dr Deep 6 Sided Impact Socket System of Measurement: Metric Type: Deep Impact Sockets Drive Size: 1/2in Heat Treated Hardened And Tempered CHROME-MOLYBDENUM Steel Use On All Air Powered & Battery Powered Impact Tools/Wrenches, Also Breaker Bars/Strong Arms & Torque Wrenches All Sockets Are 1/2″ Square Drive & 76mm Deep (From Top To Bottom Of Socket) With 6 Sides (Hex Shape) Fit For： Set Sizes Include: 29mm – 30mm – 31mm – 32mm – 33mm – 34mm – 35mm – 36mm – & 38mm All by 1/2″ Drive .