Durable Aluminum Material: This multi-angle measuring roller is made of high quality 5mm aluminum alloy and will not break due to mud or rust - more durable and stronger than the plastic. Upgraded Angle Ruler: This set includes 2 six-fold rings, metal knobs for each angle with stylish positioning holes where you can adjust six metal knobs to create your desired shape and find the up position. The right hole. With 6 bent edges, users can easily create and measure special angles or shapes from the angle finder tool to increase productivity. Metric and Imperial Units: These measurements will be in inches or centimeters . With laser etched markings, you can read measurements clearly for years to come. They won't break, fade or damage. Large-scale applications: This versatile tool is designed for creating balls, arches, cutouts and anything you can use in carpentry, brick, wood, glass, stone, laminates, construction projects, engineering, etc. Use it to mark tiles, floors, bricks, wood, laminates, metal and more