Welcome to our store Durable Aluminum Material: This Multi-angle Measuring Roller is made from high quality aluminum alloy that won't break from mud or rust - more durable and stronger than plastic. Improved angle rulers: this set includes six rings with metal knobs at each corner with elegant positioning holes where you can adjust six metal knobs to create the shape you want and find a position to the top. Good hole. With its 6 flip-up edges, the user can easily create and measure angles or special shapes of the Angle Finder Tool for increased productivity. Metric and Imperial Units: These units of measurement are expressed in inches or centimeters. With the laser etched markers, you can clearly read the measurements for years to come. They won't break, fade or be damaged. Large-scale applications: This versatile tool is designed for creating balls, arches, cutouts and anything else you can use for woodworking, brick, wood, glass, stone, laminates, construction projects, jobs, etc. Use it to mark tiles, floors, bricks, wood, laminate, metal and more!