Procraft LH1010 9-3/4" square horn flare/lens. 5-3/32" diameter bolt-on platform with a 3-7/8" diameter bolt pattern and a 2-27/32" diameter bolt pattern. Easily drilled to mate with any driver. 1" throat, 90 x 40 coverage, Lightweight ABS construction. Cutout is 8-5/8" x 8-1/2". Great quality at a great price. Very sturdy, great for pro sound. Use the Procraft LHW-3 horn adapter for screw-on drivers.