Rub collar for 1-1/4" Arbor only!, #SC534, (D) diameter: 3-1/2, (D) bore: 1 & 1-1/4, (B) Cutting height: 1-1/2, (r) radius: 3/4, Description: 1-1/2 Flute, optional rub collar: c-050, SC534 carbide Tipped 3-wing flute (convex) 1-1/2 Flute x 3/4 radius x 3-1/2 dia x 1-1/2 x 1 & 1-1/4 bore