... ). Abrasive Flap Disc 4". 2). Grit: 40#---600#. 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 ... plastic , fiber-glass and steel backing,and bonded with the abrasive cloth closely,more flex and stronger,and consistent finish.Suitable ...