The Hillman Group 180156 Nylon Insert Lock Nut， 7/16-Inch by 14-Inch， 50-Pack<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Nylon provides better capability of providing renewed locking action after removal and re-installation</li><li>Use for fastening to a bolt when mechanically joining materials</li><li>For general applications</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41MrSPSpGOL.jpg" noproxy>