The Hillman Group 4093 M5-0.80 Acorn Nut (5-Pack)<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>A hex nut with an enclosed domed cap</li><li>Use in applications where a finished appearance is desired， or for safety to cover exposed threads</li><li>Acorn nuts are also known as cap nuts</li></ul></div><img src="http://ecx.images-amazon.com/images/I/415W4UdipOL.jpg" noproxy>