Chrome vanadium steel is suitable for heavy impact drive Spring-loaded ball detent holds the socket firmly This kit applies to your hammer drive or drill bit and allows you to replace the Ratchet by Power Tool 8 Pieces Hex Shank Square Head Electric Screwdriver Extension Socket Wrench Adapters Chrome Vanadium Steel Heavy Duty Impact Drive Feature: These shock-resistant adapters can handle the most demanding applications (2000 rpm/lb). The 1/4 hex handle fits all standard quick-change chucks and drill chucks. Which is suitable for a screwdriver or tools with a handle of electric screwdriver (hexagonal hole or three jaws) drive socket, can be installed after the originalThe size of the hexagonal polygon in square size, can be used to install the socket, is a good accessory. Spezifikations: Material: chrome vanadium steelSurface treatment: black oxide The color black Steel beads: yes Quantity: 8 Hexagonal handle can be converted to square head Type : 1/4*1/4*50mm: 1/4 square head hex shank 6.35mm 3/8*1/4*50mm: 3/8 square head hex shank 9 .53mm 1/2*1/4*50mm: 1/2 hex shank Square head 12.7mm 1/4*1/4*65mm: 1/4 hex shank 6.35mm square head 3/8*1/4*65mm: 3/8 hex shank 9.53mm square head 1/2*1/4*73mm: br>