Rhino Rulers 55120 Masons Modular Spacing Ruler<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Will not warp or peel in wet weather</li><li>Washable - dirt， mud， concrete， etc</li><li>Lifespan is 3 times that of wooden rulers</li><li>Back side of ruler is used for laying bricks in conjuction with concrete blocks as backing</li><li>Excellent for any outdoor / wet use</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51C97KGJ36L.jpg" noproxy>