4pcs 1/4 3/8 1/2 Drive Socket Adapter Converter Reducer Air Impact Craftsman Socket Wrench Adapter Hand Tools Set BI115+ Description: 4pcs Convertor Set 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 enthusiasts Sprung Ball bearing fitting retainer Specification: Size: 1/2 "to 3/8" - (12.5mm square hole to 9.5mm square head) Length: 36mm