High Quality: The combination square is made of high quality stainless steel and zinc alloy, 2mm thickness ruler make it very sturdy and durable, laser etched numbers increases legibility and protects against wear. Accurate Measurement: Built in bubble level, that makes readings more accurate, Laser etched numbers increases legibility and protects against wear .One side centimeters and another side inches300mm metric system and 12" British system.Meet your different measurement needs. Multifunctional: The combination square is a good helper for woodworking and it can be used as a square, depth gauge, scriber, and a level. It's suitable for measuring lengths, widths, depths, heights, 90 degrees angles, 45 degrees miter angles and scribing. Additional AccessoriesSelf-Adjusting knurl nut easily aligns measurements, Spring Loaded Brass Bolt to Assure Accuracy, Brass scribe that stores in the handle for quick and easy marking.