CNBTR 1/4" Hex Shank Nut Driver Set Square Drive Socket Adapter Conversion head Pack of 8 Connect impact sockets/socket wrenches/sockets bits/driver sockets to power cordless drill.These adapters are handy for attaching a socket sets/Ratchet Sockets/socket wrench/Ratchet Universal Sockets Wrench to an electric drill. Spring loaded ball bearing on square driver head holds sockets securely. Suitable for screwdriver or power drills has a quick change 1/4" chuck systems or directly into drill chuck. Easy handling, the course is not easy to fall off.widely used in home DIY, carpentry, auto parts, specializing in machine repair and so on. After the installation of the original can be converted to hexagonal polygon size square head size, which can be used to install the sleeve is a good accessory conversion.