115-DW4950 Paper Board Backing Pad Backing Pad Assembly with 5/8"-11 Clamp Nut Steel Reinforced Rubber Backing Pad with 5/8"-11 Locking Nut Rubber Backing Pad with Clamp Nut Phenolic Disc Kool Flex Backing Disc Model Code Model Description AAArbor Diam:7/8 in, Dia.:4 1/2 in, Speed:16000 rpm [Max] ABDia.:4 1/2 in, Speed:12000 rpm [Max] ACDia.:4 1/2 in, Speed:16000 rpm [Max] ADDia.:4 3/4 in, Speed:6000 rpm [Max] AEDia.:5 in, Speed:6000 rpm [Max] AFDia.:6 1/2 in, Speed:8500 rpm [Max]