2 required per Cutter. Each item number consists of one of each, #BU-722, (D) diameter: 1-1/4, (D) bore: 1-1/8, a: 13/64, C: 1-3/4, B: 1/4bu-722 shaper Cutter T Reduction bushings (with flange) 1-1/4 to 1-1/8