The Hillman Group 220202 Grade 8 Hex Cap Screw， 7/16-Inch X 4-1/2-Inch， 25-Pack<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>A common feature on a hex cap screw is a washer surface directly under the head which creates a better seal</li><li>An alternative for using them without nuts is to install them directly into a compatible internally threaded hole</li><li>Grade 8 screw</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31z-KCxlpoL.jpg" noproxy>