A fine notch is in the end of the ruler to place a pencil The stop is secured with two thumb screws , help stop and fix at any position ， effectively slippage top Aluminum-alloy and made by CNC-prcess.The surface is anodized , wear-resistant , rust-proof , thick yet light enough to not be clunky The numbers are engraved by , which can be used for tens of thousands of times without wearing out Scribing ruler for woodworking , , handicrafts , Ideal measuring tool for carpenters With Inch and Metric Indicators on both sides , this steel ruler has clear and accurate scale , easy to read, Manufacturer: Watreketal