... ",7". 4). Usage: For Metal. Aluminum Oxide Abrasive Cloth Flap Disc Advantage:1). High quality Aluminum Oxide emery cloth, fibreglass backing ... closely,more flex and stronger,and consistent finish.Suitable for flat welds,angle welds and etc. Such as: grinding metal surfaces ... , removing weld, edges, joints and rust, etc.3).Flat emery cloth wheel mounted on a portable angle grinder to ...