TWO FIXING METHODS: Our square ruler has mounting holes for mounting clips and mounting holes for M5 (8mm) screws. Therefore, in addition to fixing with the fixing clip supplied in the kit, it can also be fixed with screws. You don't have to worry about losing the fixing clip, you can also use screws to fix it. Double protection brings you convenience. PRECISE RULER: Our square ruler contains a precise ruler, which can help you measure the length of the model better and more accurately during operation. The accuracy of our ruler is mm, and the measuring length of the ruler is 140mm. Our ruler is located on the side of the square, which can be more convenient and direct to measure the length of the board. WELL MADE: Our square ruler is made of a hard aluminum block with a surface anodized, which is very durable and not easy to corrode. And there will be no slippage during use. And our scales are very accurate and clear, which is very helpful for you to make more exquisite works. THICKNESS MEASUREMENT: The maximum board thickness our square can repair is about 5 (due to manual measurement, please understand if there is any error.), which may be the size of the board you use every day, and is very suitable for your daily use. AFTER-SALES SERVICE: Please feel free to encounter any problems during the use process, please contact us in time, we will do our best to serve you and help you solve the problem.