The four quadrangular square pole mounting lamp brackets have 4 arms at 90 inches; and are designed to be slidably fitted to a 2-3/8 inch tenon. Can also be used for 2-7/8 and 4 inch tenons. The typical application of four round square pole lamp brackets is on wood, steel and concrete poles. Comes with a removable cover and assembled hardware. Available in hot-dip galvanized (HDG), deep bronze, black, dark gray, white or natural aluminum finishes. 4 inch square pole bracket, carbon steel, bright bronze/base: 3 screw holes for 3/8" -16/tennon: 4x vertical tenon, 90D, OD60x HT4