HHIP 4002-0003 Shank Fly Cutter Set, 3/8" - 1/2" Capacity, 3 Piece, 3/4" Utilizes standard tool bits 3/4" Shank Made of durable hardened steel & counter balanced. Cuts flat and smooth surface with a single cut 1 1/2, 2 & 2 1/2" are the diameters of the tool bit heads