Specifications: Chrome vanadium steel is 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. 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. Type: Drill Bits Set Quantity: 3 Pcs Material: Chrome-vanadium Steel Cr-v Size Details 1/4" x 1/4" x 50mm--1/4 "shank can be converted into 6.35 mm square. 3/8" x 1/4" x 50mm--1/4 "shank can be converted into 9.53 mm square. 1/2" x 1/4" x 50mm--1/4 "shank can be converted into 12.7 mm square. Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Socket Adapter Hex Shank Set(3 Pcs)