The X-LOCK R444 Expert for Metal Fibre Disc produces an impressive finish on metal surfaces. It features a stable vulcanised fibre backing that enables a consistent grinding process. Its aluminium oxide grain is particularly suited for work on metal applications. This fibre disc is intended for deburring, welding preparation and blending on carbon steel, mild steel, aluminium, non-ferrous metals and cast iron. It is also ideal for removing discolouration, stock and surface imperfections. Changing fibre discs is fast and convenient thanks to the keyless X-LOCK system. Discs are suitable for clamping on an X-Lock or standard rubber backing pad. X-LOCK sanding discs also fit standard angle grinders.