The Hillman Group 2903 Hex Tap Bolt， 1/2 -13 X 6-Inch， 4-Pack<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Uses a 3/4 In. wrench</li><li>Low carbon bolt</li><li>To be used in holes which have fully threaded holes</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31ZqMFxJ%2BrL.jpg" noproxy>