PRECISE SPEED SQUARE : The speed square has a measuring range of 0-7 inch. Its black surface is effective to prevent light reflection, also resists dirt. The edges are flat to prevent scratch. ANGLE MEASURING : The carpenters square can not only measure the length, but also quickly determine the angle from 0-90 degrees. There is a quick conversion table on the front of the triangle ruler. It is helpful for you to save time and improve work efficiency. USEFUL WOODWORKING TOOLS : The hollow auxiliary graphic frames allow you to quickly draw lines and graphics on the wooden board. The practical T-shaped fixed edge can be attached to the wooden board, so you can easily perform horizontal or bevelled cuts without moving left and right. HIGH QUALITY MATERIAL : Made of high quality aluminum alloy, high hardness, matte black color, good workmanship, effectively prevent strong light reflection, not easy to rust and wear, not easy to break, sturdy and durable. The corners of the triangle are passivated to prevent scratching your hands. WIDE RANGE OF APPLICATIONS : Carpenter's triangular are suitable as a cutting guide for woodworking, frames, protractors, mitres, liners, saw guides, brackets and edges in woodworking, for the production of furniture and construction models, very suitable for all constructions and renovation projects.