Competition Cams 4792 Top Dead Center Stop， 18mm Bolt-Style<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Positively stop piston in order to find Top Dead Center (TDC)</li><li>Bolt style screws into spark plug hole while plate type bolts across any cylinder bore when heads are off</li><li>Features bolt style screws and plate type bolts</li><li>Manufactured using high quality material</li><li>Easy installation</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31EiZj4NbFL.jpg" noproxy>