"B AND C Rectangular Horn Flare w/1-in throat entry 12.2-in x 5.6-in x 4.9-in - ME45 90 Degrees x 40 Degrees nominal coverage, Exponential flare, Very good loading down to 1 kHz Throat diameter: 25 mm (1.0-in), Nominal coverage horizontal: 90 Degrees, Nominal coverage vertical: 40 Degrees Cutoff frequency: 1.0 kHz, Material: Cast Aluminium, Dimensions: 310x140x124 mm (12.2 x 5.6 x 4.9-in) Mounting & Shipping Info, Baffle cutout dimension: 260x110 mm (10.2x4.3-in), Net weight: 0.8 kg (1.8 lb) Shipping units: 4, Shipping weight: 4.9 kg (10.8 lb), Shipping box: 540x350x185 mm (21.2x13.8x7.3-in)"