Rub collar for 3/4" Arbor only, #929, (D) diameter: 2-5/8, (D), bore: 1/2 & 3/4, (b) Cutting height: 1-1/2, (r) radius: 1/2, B1: 1, D1: 1-5/8, Description: 1 bead, optional rub collar: c-005, 929 carbide Tipped 3-Wing bullnose 1/2 radius x 1 bead radius x 2-5/8 dia x 1-1/2 x 1/2 & 3/4 bore