The Hillman Group 3327 ¼-20 x 3/4-Inch Expansion Nut， 10-Pack<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Used to seal bolt holes top prevent leaking</li><li>Also used to dampen vibration</li><li>Can be used in blind and closed-end holes</li><li>Quantity per pack: 10</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41%2BcunruL9L.jpg" noproxy>