DURABLE MATERIAL: This adjustable set square carpentry is made of stainless steel and aluminum alloy material, durable etched, and heavy-duty suitable for rough usage as well. HIGH ACCURACY: The engineering square is constructed like there are zero mistakes in measurement. The spirit level helps to know the leveling of flat surfaces with precise accuracy and readings. MULTIFUNCTION USAGE: This tri square is suitable for marking Square, Depth lengths, widths, 90 degrees angles, 45 degrees miter angles, heights, and scribing. COMPATIBILITY: The engineers square set is suitable for measuring, marking out, and laying out dimensions of any surface or object while the spirit gauge can be used to measure any surface to know the precise level of the surface. SATISFACTION GUARANTEED: We believe in the quality of our combination square set and the satisfaction of our customers is our top priority. if you are not happy with an adjustable square for any reason. Please feel free to contact us to get a FULL REFUND, Manufacturer: MAXPERKX