Rub collar for 1-1/4" Arbor only, #987, (D) diameter 5-1/2, (D) bore 1 & 1-1/4, (B) Cutting height 11/16, (r) radius 1-9/16, B1 1/4, C 1-1/2, Optional rub collar c-017, 987 carbide Tipped 3-wing cove raised panel 5-1/2 DIA x 11/16 x 1 & 1-1/4 bore For 11/16 material.