Rub collar (sold separately) for 3/4" Arbor only, #999, (D) diameter 2-7/8, (D) bore 1/2 & 3/4, (b) Cutting height 1-1/2, B1 3/64, D1 2-1/8, Description finger joint, L 3/8, optional rub collar c-011, 999 carbide Tipped 3-wing finger joint 2-7/8 DIA x 1-1/2 x 1/2 & 3/4 Bore