Features: Each has been quenching heat treated ,sturdy and wear resistant. Chrome vanadium steel for heavy impact drive suitable quick replacement of 1/4"chuck system or direct drilling into chuck. Chromium vanadium steel is suitable for heavy impact drive. The spring loaded ball detent firmly holds the socket. This kit is applied to your impact drive or drill bit, and allows you to replace the ratchet with an electric tool. These shock resistant adapters can meet the most demanding applications (2000 RPM/lb). 1/4 "hexagonal handle is suitable for all quick - change chuck and standard drill chuck. Suitable for a screwdriver or electric screwdriver handle tools (hexagonal hole or three jaw chuck) drive socket, can be installed after the original hexagonal polygon size into square size, can be used to install the socket, is a good accessories. Specifications: Material: chromium vanadium steel Surface treatment: black oxide Color: black Steel beads: yes Quantity:5 The hexagon handle can be converted to square head Type : 1/4*1/4*50mm: 1/4 hex shank - - 6.35 mm square head 3/8*1/4*50mm: 3/8 hex shank - - 9.53 mm square head 1/2*1/4*50mm: 1/2 hex shank- - 12.7 mm square head 1/4*1/4*25mm: 1/4 hex shank - - 6.35 mm square head 1/4*1/4*30mm: 1/4hex shank - - 6.35 mm square head Package Included: 5 x Socket Bit Adapters