High frequency acoustic waveguide for bolt on drivers with 2in Throat This waveguide helps focus optimal output in a partilar pattern for minimal dispersion loss 25mm Waveguide opening width 152mm Waveguide opening height 7 06 in front to rear length 5 13 in Front Width 6 31 in Front Height 4 69 in Rear Round Plate Diameter Bolt hole to next center about 73mm Equipment shown is not included