Dophee 8Pcs Socket Adapter Impact Hex Shank Drill Bits Bar Set 1/4" 3/8" 1/2" Bits New Material: chrome vanadium steel. Chrome vanadium steel suitable for heavy duty impact drivers. Spring loaded ball bearings on each square head securely and locks into sockets to avoid slippage during using. This set is perfect for your impact driver 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 standard drill chucks. Suitable for a screwdriver or electric screwdriver handle tools (hexagonal hole or three-jaw chuck can) drive sleeve and after use can be installed on the size of the original hexagonal polygons converted to square head size, which can be used to install the sleeve is a good accessory to convert. 8pcs 1/4" 3/8" 1/2" CR-V impact socket adapter Sizes: 4 pieces of 1/4 inch drives, 2 pieces of 3/8 inch drives, 2 pieces of 1/2 inch drives. Compatible with power drills and screwdriver handle tools. Suitable for quick change 1/4" chuck systems or directly into drill chuck. Change your hand socket set into a driven socket set.