... 3). Size: 4",4.5",5",6",7". 4). Usage: For Metal. Aluminum Oxide Abrasive Cloth Flap Disc Advantage:1). High ... quality Aluminum Oxide emery cloth, fibreglass backing. Rapid stock removal. For weld grinding, surface preparation, blending, cleaning, deburring. Fitting to ... cloth closely,more flex and stronger,and consistent finish.Suitable for flat welds,angle welds and etc. Such as: grinding ...