High Quality: The combination square is made of high quality stainless steel and zinc alloy, 2mm thick ruler makes it very sturdy and durable, laser engraved numbers increase readability and protect against wear. Accurate Measurement: Built-in bubble level, which makes readings more accurate, laser engraved numbers increase readability and protect against wear. One side in centimeters and another side in inches: 300mm metric system and 30.5cm British system. Meet your different measuring needs. Multifunctional: The combination square is a good helper for woodworking and can be used as a square, depth gauge, scriber and level. It is suitable for measuring lengths, widths, depths, heights, 90 degree angles, 45 degree miter angles and scribing. Additional Accessories: Self-adjusting knurled nut easily aligns measurements, spring-loaded brass bolt to ensure accuracy, brass tip stores in handle for quick and easy marking.