Rub collar for 1-1/4" Arbor only, #989, (D) diameter 3-39/64, (D) bore 1 & 1-1/4, (B) Cutting height 1/2, (r) radius 1/4, C 7/8, optional rub collar c-045, 989 carbide Tipped 3-wing raised panel Back cutter with ball bearing rub collar 1/4 radius x 3-39/64 DIA x 1/2 x 1 & 1-1/4 bore