[MATERIAL] -- The socket adapter set is made of high quality chrome vanadium steel and is suitable for heavy duty impact drivers.The socket bit adapter is sturdy, smooth, very durable and can be used for a long time. [BEARING DESIGN] -- Each square head of the hex shank drill bit set has a spring-loaded ball bearing, which can lock securely in the socket and prevent slipping during use.This socket adapter set is ideal for automotive repairs, DIY and most household repairs. [USE] -- The hex socket adapter fits 1/4" quick change chuck systems or directly to the drill chuck. Transform your hand socket set into a drive socket set. This set ofimpact socket adapters is perfect for your impact drill or drill, and allows you to replace your ratchet with a power tool. The 1/4" hex shank fits all quick change chucks as well as power tools.standard drill chucks. [APPLICATION] -- The drill socket adapter is suitable for screwdriver or electric screwdriver handle tools (hexagonal hole or three-jaw chuck);after use, it can be installed on the size of the original hexagonal polygons converted to square head size, which can be used to install the socket.It is a good accessory for conversion. [APPLICATION] -- The drill socket adapter is suitable for screwdriver or electric screwdriver handle tools (hexagonal hole or three-jaw chuck), and after use, can be installed on the size of the converted original hexagonal polygonsin square head size, which can be used to install the socket.This is a good accessory for conversion.