Rub collar for 3/4" Arbor only!, #SC402, (D) diameter: 4-15/16, (D) bore: 1/2 & 3/4, (b) Cutting height: 23/32, (r) radius: 1-15/32, C: 3/8, R1: 7/8, optional rub collar: c-004, R2: 7/8, SC402 carbide Tipped 3-Wing Ogee raised panel 4-15/16 dia x 23/32 x 1/2 & 3/4 bore For 3/4 material