This Toolpak Tungsten Carbide Grinding Disc is designed for use on rough concrete, fiberglass, tiles, stone, and brickwork. It fits any 115mm (4 1/2 Inch) angle grinder with a bore diameter of 22mm and has an RPM range of 1000 - 2500rpm. Suitable for materials including concrete, fibreglass, tiles, wood, stone, brickwork, glass, plastic, and laminates. Manufactured from tungsten carbide.