Incra RULE18 18-Inch Incra Rules Marking Rule<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Micro-fine marking holes and slots at every 1/16"， 1/32" and 1/64" instantly locate a sharp pencil point or scribe EXACTLY where you want it.</li><li>Instantly mark your position with zero uncertainty， zero parallax and zero eye strain</li><li>Flexible structure for working on curved surfaces</li><li>Ultra thin for ultra precision</li><li>Common ruler?...NO. Common sense?... Yes!</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31ePjLB03jL.jpg" noproxy>