Material: This sturdy square blade is made of high-quality stainless steel, durable and rust-resistant. Size: This carpentry square is 30.5 cm long and the blade is precisely marked. Wide Application: This combination square set is ideal for marking 45- and 90-degree angles and can also function as a handy gauge for transferring precise angles and other measurements; essential for use in your rafter, deck, stair, and roofing projects, and in other general carpentry operations. This T-square allows you to make quick and accurate markings and measurements.