1/4 3/8 1/2 Drive Socket Adapter Converter Reducer Air Impact Craftsman Socket Wrench Adapter Hand Tools SetSize:1/2 “”to 3/8″” – (12.5mm square hole to 9.5mm square head) Length: about 36mm3/8 “”to 1/4″” – (9.5mm square hole to 6.3mm square head) Length: about 26mm3/8 “”to 1/2″” – (9.5mm square hole to 12.5mm square head) Length:about 35mm1/4 “”to 3/8″” – (6.3mm square hole to 9.5mm square head) Length: about 25mmDescription:This set allows you to mix and match drive sizes for your sockets, ratchet handles, extension bars and other accessories.Ideal tool for mechanics, engineers, carpenters or DIY enthusiastsSprung Ball bearing fitting retainerHeight: about 25mm, 26mm, 35mm, 36mmHardness: 60HRCMade from Chrome Vanadium SteelColor:BlackPackage: 1pcs adapter