Mono Point Crossbar Round 4.76"OD x 14 Gauge Steel. Zinc plated steel. Universal slotted mounting screw pattern for 4" octagonal (round). Center opening and screw hole for interchangeable center mounting plates (for 1/8"IP – 1/2"IP tapped & half ball). -slotted extruded holes for half ball ended cables that allow side to side adjustment. 2-6/32" tapped mounting screw holes for canopy recessed mounting screws.