The Hillman Group 43452 5/16-18-Inch x Locking Flange Nut， 15-Pack<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Flange lock nuts are one piece， all-metal prevailing torque hex flange nuts</li><li>The protruding circular flange increases the nut's bearing surface allowing them to be used with irregular and oversized holes</li><li>Grade 8 alloy steel</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41mi%2BNxGvDL.jpg" noproxy>