Product Description:Material: CRVColor:Silver/BlackSize:1/2inch to 3/8inch: 12.7mm square hole to 9.53mm square head3/8inch to 1/4inch: 9.53mm square hole turn 6.35mm square head3/8inch to 1/2inch: 9.53mm square hole turn 12.7mm square head1/4inch to 3/8inch: 6.35mm square hole to 9.53mm square headFeatures: 4pc Ratchet Socket Adapter Reducer Converter Set Tool Kit.Chrome vanadium drop forged heat treated steel with black oxide finish.Spring loaded ball bearing retains socket Ball detent locks onto drive tang.This set allows you to mix and match drive sizes for your sockets, ratchet handles, extension bars and other acessories.Ideal tool for mechanics, engineers, carpenters or DIY enthusiasts.Package Included:4pcs x Drive Ratchet Socket Adapter