This nylon template is designed to simplify cutting odd-angled tile, brick, flooring, shingles, and other trim. Loosen the knobs, make the Angle-Izer fit into the space your workpiece needs to go, tighten the knobs, then use the Angle-Izer to mark your workpiece. It comes with a CD-ROM (Windows only) which has a brief video demonstration of the Angle-izer in action, and a calculator for cutting wedge-shaped parts for arches and/or circular openings. The glass-filled nylon construction makes the Angle-Izer virtually indestructible, and its graduated in both inches and centimeters.