2 Pack Procraft LH1200 11-7/16" Diameter, 5-1/2" deep horn flare/lens. 1-3/8"-18 TPI threads, 1" throat, 75 degrees conical dispersion, Lightweight ABS construction. Cutout is 10-5/8". Mounting screws included. Great quality at a great price. Use the ADM25-25 for bolt-on drivers.