Incra rulers feature micro-fine guide holes and slots at standard scale positions. Using a scribe or a 0.5mm mechanical pencil, these holes and slots allow you to place your mark with absolute precision. The incra rulers are made from ultra thin stainless steel with engraved lines and characters on a matt finish for easy legibility. We like them a lot. Made in USA. Click on any of the pictures below for more detail on the Incra Ruler that interests you.