Features: 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 Set includes the following sizes: 1/2" F x 3/8" M, 3/8" F x 1/4" M, 3/8" F x 1/2" M , 1/4" F x 3/8" MMadeChrome Vanadium SteelSprung Ball bearing fitting retainerHeight: about 22mm, 25mm, 35mm, 36mm Package Included: 4 x Converter Reducers Adaptors