An angle grinder is a popular power tool used for grinding using abrasive products. Various types of abrasive products can be used for grinding, also known also as de-burring, fettling, polishing, sanding and buffing. Safety recommendations depend on the type of abrasive you will use on your hand-held machine: reinforced depressed centre wheels, flap discs, vulcanized fibre discs, resinoid cup wheels and diamond cup wheels.