[QUALITY]:The combination square ruler is made of high quality stainless steel and zinc alloy, the 2mm thick ruler makes it extremely sturdy and durable, and the laser-engraved numbers increase readability and prevent wear. [FUNCTIONALITY]:Built-in level for more accurate reading, laser-engraved numbers for better readability and to prevent wear. [One centimeter on one side, one inch on the other]:300mm metric and 12" inches. Meet your different measuring needs. [Design]: Self-adjusting knurled nut for easy alignment of measurements, spring-loaded brass bolts for accuracy, and a brass punch that stores in the handle for quick and easy marking. [USE]: Self-adjusting knurled nut makes it easy to align measurements, spring-loaded brass bolt ensures accuracy, and the brass tip stores in the handle for quick and easy marking.