Silverline 115mm 60 Grit Heavy Duty Aluminium Oxide Flap Disc Power. This heavy-duty disc features aluminium oxide cloth bonded to a fibreglass backing disc, offering a long-life, self-renewing design that lasts up to 28 times longer than fibre discs. It is designed for use with hand-held angle grinders and is suitable for grinding, finishing, stock removal, and weld dressing on materials such as steel, cast iron, alloys, and wood.