Over 250 different cutters for all your shaping needs. Extra-thick carbide tips offer many sharpening and longer tool life. Rpm rating: 12, 000 and under. Cutters are furnished with either 1/2," 3/4" Or 1-1/4" Bore. Cutters with 3/4" Bore include 2 reduction bushings (1/2" X 3/4") which will reduce the bore to 1/2."Cutters with 1-1/4" Bore include 2 reduction bushings (1" X 1-1/4") which will reduce the bore to 1", #SC611, (D) diameter: 2-7/8, (D) bore: 1/2 & 3/4, (b) Cutting height: 1/4, SC611 carbide Tipped 3-Wing straight edge 2-7/8 dia x 1/4 x 1/2 & 3/4 bore