Pyle-Pro PH612 Screw-On Type Constant Radiation Horn Material: ABS Resin Nominal Coverage Angle (HxV)-6 dB:90x40 Cut Off Frequency: 1000 Hz Throat Diameter: 26mm - Dimensions: 6.4"h x 11.9"w x 4.4"d Mounting Type: Zinc Screw Insert 1 3/8''- 18 UNEF Cut off frequency: 1000Hz Throat diameter: 26mm Mounting type: Zinc screw insert 1 3/8" - 18 UNEF 11.9' W x 6.3' H x 4.3' D