Used as a professional carpentry Compasses for woodworking,metal processing or leather products. Drawing compasses,used for repeated measurement or drawing arcs and Circles. Crafted from Aluminum,simple and convenient daily maintenance,wear resistant. With its lightweight and portable designs,this aluminum ruler is easy to carry and convenient for use in various woodworking setting. Whether you are a professional woodworkers or a enthusiasts,this positioning ruler is essentialtool for ensuring precise and efficient woodworking result.