The CRL Round Edge Template Guide is a precise Corner Cutting Template with a variety of commonly used radii. Its solid plastic construction makes it economical and unbreakable so it will last for years. It gives 12 radii ( 10 to 70 mm ) to pick from, allowing you to score precise, repetitious cuts for tabletops, shelves, automotive glass, mirrors and more. Manufactured in a tough, durable material, the RET12 features four slip-resistant pads that not only keep the Template in place during use, but also reduce the risk of scratching the glass.