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: SkyPOOU