Rub collar for 3/4" Arbor only!, #SC424, (D) diameter: 3.000, (D) bore: 1/2 & 3/4, (b) Cutting height: 7/16, (r) radius: 5/32, B1: 5/16, D1: 2-11/16, Description: 5/16 bead, optional rub collar: c-019, T: 1/16, T1: 5/16, SC424 carbide Tipped 3-wing wainscot with bead cutters 3 DIA x 7/16 x 5/32 radius x 1/2 & 3/4 Bore For 3/4 material