The Ultra Rule precision ruler looks like an ordinary ruler, until you look closely. You’ll find that it is laced with micro-fine marking holes at every scale position to instantly locate a sharp pencil or scribe exactly where you want it. You can effortlessly place your mark precisely on target with zero uncertainty and no eye strain. Perfect for precision guide placement, marking ferrule cutoffs, & so forth. Extremely flexible stainless steel with permanent markings in inches and millimeters. Rules include a 0.5 mm mechanical pencil. Precision component placement is the mark of a professional – get serious with the Ultra Rule.