Special highlight: • Consist of 3 types: 1/4" 3/8" 1/2&quot • Hex shank fits all quick change chucks as well as standard drill chucks • Spring loaded ball bearing on head holds sockets securely • This is the perfect impact driver or drill and allows you to replace your ratchet with a power tool. • Aluminum ring can be active • Spring loaded ball bearing on head holds sockets securely Function: • Act as a connector for joining parts or devices having different sizes.