A cutting disk (or cut-off wheel) is a thin, circular abrasive tool that rotates at high speeds to slice through metal, stone, tile, wood, and concrete. Sized typically between 4 inches (115mm) to 9 inches (230mm) for handheld angle grinders, they generally range from 0.8mm to 3.2mm in thickness. The thinner the disk, the faster and cleaner the cut, whereas thicker disks offer a longer operational lifespan.