This is a A-RBW1-18 W HUB 1 1/8 RD BORE PN: RBW1-18Main Description As Following : A-RBW1-18 W HUB 1 1/8 RD BORE P.N: RBW1-18 Dim A (1): 1-5/8"Dim B (2): 1-13/16"Dim C (3): 7/16"Dim D (4): 1"Dim E (5): 1/4" x 1-1/4"Bore: 1-1/8" Crossed From: WSH20018 , , 3016-0117 , , 673-S80021300 , , 673S80021300 , Found in Section & Models : Tractor Parts Associated Items : New Also This is An Aftermarket Product And : Dim A (1): 1-5/8" Dim B (2): 1-13/16" Dim C (3): 7/16" Dim D (4): 1" Bore: 1-1/8" Keyway: 1/4" x 1-1/4"