Stanley Proto J7121 1/2-Inch Square Extension， 7/16-Inch Hex<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Made of forged steel</li><li>Size stamped on tool for easy identification</li><li>Ball detent</li><li>Not for use on impact applications</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31CeE2HmCtL.jpg" noproxy>