Rub collar for 3/4" Arbor only, #969, (D) diameter 3-1/4, (D) bore 1/2 & 3/4, (b) Cutting height 7/8, (r), radius 1/2, B1 3/8, C 3/4, D1 1-3/4, Optional rub collar c-006, 969 carbide Tipped 3-wing Ogee 1/2 radius x 3-1/4 dia x 7/8 x 1/2 & 3/4 Bore