MULTI-FUNCTION (MEASURE AND MARK)using a multi-regulatory card ruler, you can do 5 different things! From measuring 45 degree, 90 degree, depth, width to drawing line. ABOUT MANY MULTIFUNCTIONAL TOOLSMeasuring tools are definitely multifunctional. You can insert a straight ruler, it works like a hard card. BUILT-IN LOCKING DEVICEThe aluminum alloy T-ruler is a built-in locking device, making measuring and marking more Accurate, caliper is easy to read and move for horizontal, vertical, long, short, parallel and right angle lines Meet various operations. Bring you a new and different feeling of use. ALUMINUM ALLOY RULERThis T ruler is made of high quality aluminum alloy materials with good corrosion resistance and oxidation-proof, rust-proof, stable quality and long service life. PACKING LIST1 x Woodworking Ruler; Range: 0~300mm/11.8inch; Precision: 0.05mm/0.019inch; Purpose: multifunctional angle measuring, drawing and line marking.