3M™ nut disc pad hub, 2-1/2 in W dia, for use with: 4 to 9 in face plate and right angle grinder with 5/8-11 EXT short shaft. 3M™ 00051144887439 Nut Disc Pad Hub, 2-1/2 in W dia, for use with 4 to 9 in Face Plate and Right Angle Grinder