Pyle-Pro PH715 Bolt-On Type Constant Directivity Horn Material: ABS Resin Nominal Coverage Angle (HxV) 6dB:90 x 40 Cut Off Frequency: 1000 Hz Mounting Flange Diameter: 100mm - Dimensions: 6.25"h x 16.5"w x 8.65"d Mounting Type: Zinc Screw Insert 1 3/8'' - 18 UNEF Cut off frequency: 1000Hz Throat diameter: 26mm Mounting flange diameter: 100mm Mounting hole diameter: 6mm Mounting hole number: 4N