Procraft LH812 12-1/2" x 7-13/16" horn flare/lens.3-9/16" diameter bolt-on platform with a 2-15/16" diameter 4 bolt pattern. Easily drilled to mate with any driver. 1" throat, 90 x 50 coverage, Lightweight ABS construction. Cutout is 10-1/4" x 6-3/8". Great quality at a great price. Very sturdy, great for pro sound. Use the Procraft LHW-3 horn adapter for screw-on drivers.