3M™ Disc Pad Hub 11823, GL Quick Change, 4-1/2 in 5/8-11 Internal
Hub is used with color-coded extra hard, hard, medium, and soft backup plates. 4 1/2 in diameter hub can be used with 7 in face plates. Use with 3M™ Fiber Discs GL (formerly Grit-Lok™ attachment system). Adaptors available for M10-1.25,M10-1.50,3/8"-24 shafts.