The numbers are engraved by, which can be used for tens of thousands of times without wearing out top Aluminum-alloy and made by CNC-prcess.The surface is anodized, wear-resistant, rust-proof, thick yet light enough to not be clunky 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 With Inch and Metric Indicators on both sides, this steel ruler has clear and accurate scale, easy to read Scribing ruler for woodworking,, handicrafts, Ideal measuring tool for carpenters, Manufacturer: SHANGYAKEJI