... ",5",6",7". 4). Usage: For Metal. Aluminum Oxide Abrasive Cloth Flap Disc Advantage:1). High quality Aluminum Oxide emery cloth, fibreglass ... used on angle grinder.2). With plastic , fiber-glass and steel backing,and bonded with the abrasive cloth closely,more flex and stronger ... weld, edges, joints and rust, etc.3).Flat emery cloth wheel mounted on a portable angle grinder to meet the requirements of ...