This Hex shank turn square connector turns any power drill into a power nut driver sturdy spring-loaded ball bearing holds sockets securely in place, sockets Snap-on tightly and won't slip off. Hexagonal shank, general Specifications edge 6.35mm 1/4. Suitable for a screwdriver handle or electric screwdriver tool drive sleeve to use. Features: Hex shank turn square connector, length 50mm, turn 1/2"(12.5mm), 3/8" (10mm), 1/4" (6.3mm) connector. Made from chrome vanadium steel, suitable for heavy duty impact drivers. Spring loaded ball bearing on head holds sockets securely. Suitable for quick change 1/4" chuck systems or directly into drill chuck. Change your hand socket set into a driven socket set (HEX turn to square head). This set is perfect for your impact driver or drill, and allows you to replace your ratchet with a power tool. These impact ready adapters are rated for the most demanding of applications (2000 in/lb of torque). The 1/4" hex shank fits all quick change chucks as well as standard drill chucks. Hex shaft saves time changing out of power drill saves time over traditional hand operated nut drivers. Kit hardened & treated chrome-vanadium steel alloy for superior strength & durability prevents stripping during high speed drill operation. After install the hexagonal size can be converted to square head size, so use to install the sleeve. Specifications: Material: CR-V Length: 50mm Size: 1/4 to 1/4 hex shank, 3/8 to 1/4 hex shank, 1/2 to 1/4 hex shank Package size: 10*7*1.5cm/3.93*2.75*0.59in Package weight: 70g Note: Item color may show sight aberration due to different shooting light and monitor display. Packing list: 1* 3pcs 50mm Socket Adapter