1、ACCURATE AND WEAR RESISTANT: The pocket ruler is made of excellent aluminum alloy, made of CNC technology. Numbers are laser engraved on the ruler surface and can be used tens of thousands of times without wearing out. The surface is frosted and anodized, resistant to abrasion and rust, thick and light 2、WITH STOPPER: The ruler has a thin notch at the end. Set the stop, place the pencil in the notch, and you have an instant marker gauge. The strong block is secured with two wing screws to lock it to the ruler. Simply slide it off the ruler and through the slot on the ruler blade to help stop and fix in any position, effectively preventing slipping. This facilitates repeated measurements on multiple plates 3、ACCURATE WOODWORKING RULER: With inch and metric indicators and measuring scales on either side, instantly converting the steel ruler into the desired woodworking unit of measurement. All four edges are engraved with a scale that increases every 1/16 or 1 mm, depending on the style. The scale is clear, accurate and easy to read 4、VERTICAL MEASURING T SHAPED TRACK RULER: When you need to measure vertically, slide the stop off the end and insert it into the cut out blade, then your ruler has a perfect stand to keep it upright. The side is marked with 1/4, 1/2, 3/4 depth measurement units, which can meet a variety of measurement needs 5、3 COMBINATION SCRIBING RULER: Complete set of 6in/160mm, 8in/210mm, 12in/300mm pocket woodworking ruler, including built in sliding block. It is an ideal measuring tool for woodworking, can also be used for professional marking ruler such as DIY and handicrafts