Rub collar for 3/4" Arbor only, #939,(D) diameter: 2.000, (D), ore: 1/2 & 3/4, (b) Cutting height: 1-5/8, (r) radius: 1/4, B1: 5/16, B2: 3/8, B3: 5/8, D1: 1.457, Description: window sash, optional rub collar: c-043, 939 carbide Tipped 3-wing window sash 2 DIA x 1-5/8 x 1/4 radius x 1/2 & 3/4 Bore