"The carpenter’s square is a calibration tool that serves to mark the material and verify compliance with the calculations, helps the master mark the site, materials, parts, and then control the progress and quality of work. The square is used to check the right angles of various buildings and structures, to control the mutual perpendicular between the parts, so its main quality is an ideal angle of 90 degrees Material: Aluminum AMG3, which guarantees reliability and resistance to external influences. "