High quality: 7 inch rafter square is made of precision large-scale aluminum alloy, solid aluminum alloy is durable, high hardness, corrosion resistance, after many polishing treatment, the surface is smooth and does not hurt hands, easy to carry. Precision durability: Precise clear scale and permanent marking for maximum durability, it is easy to read and long-lasting use, carpenter square gives accurate measurements, marking down to the finest millimeter. Multifunctional Combination ruler Set: The 12-inch combination square can be used as a level, depth gauge, and scale, while the 7-inch rafter square can be used as a scriber and saw blade guide Easy to use: easy to read the levelness, you can easily put the rafters flush with wood, embedded magnets have good suction, stainless steel ruler is easier to slide measurement, stainless steel ruler is easy to disassemble, increasing the practicality and versatility of the product. Multi-function:7 inch multi-scale rafter ruler is widely used, suitable for marking square feet, 45 degree line, protractor, frame square feet, triangle square feet, horizontal base, is a good partner of carpenters and construction workers.