MATERIAL IS 6061 ALUMINUM; MOUNT HAS TWO MOUNTING HOLES WITH 0.344 INCH DIAMETERS CETRALLY LOCATED 4.562 INCHES APART ALONG THE BASE; MOUNT HAS TWO MOUNTING HOLES WITH 0.406 INCH DIAMETERS CENTRALLY LOCATED TRAVELING HORIZONTALLY THRU UPRIGHT COLUMNS OF MOUNT; MOUNT HAS TWO DRIVE SCREW HOLES OF 0.120 X 0.250 COUNTERBORED CENTRALLY LOCATED MIDWAY BETWEEN A HORIZONTAL MOUNTING HOLE AND A BASE MOUNTING HOLE