1、Aluminum Alloy: This woodworking triangle ruler is made of aluminum alloy die casting, which has excellent oxidation resistance, rust resistance, high hardness, no breakage, and long service life. 2、Clear Scales: The triangle has a matte finish to prevent dazzling. The laser etching scale provides you with high accuracy and readability, and greatly improving the measurement efficiency. 3、Versatile Usage: The metal rafter ruler can be served as a protractor, saw guide, woodworking compass, triangle ruler, and frame ruler, suitable for various home renovation and woodworking projects. 4、Easy to Use: With exquisite workmanship, this rafter square has flat tangents, so you can easily make the ruler level with the wood, forming a straight or diagonal line proportional to the edges of the wood. 5、Safe and Practical: This metal triangle ruler has a simple structure and lightweight design, and can be hung and stored when not in use. With glossy and flat appearance, and does not harm your hands.