"ITEM IS QUADRILATERAL SHAPED AND CONSISTS OF CORROSION RESISTANT STEEL FRAMES,RETAINING AND MAIN,HOLDING ONE PANE OF 2-PLY,0.50 IN. THICK,ELECTRICALLY HEATED GLASS AND AN ELECTRICAL PLUG AND CLAMP SUPPLYING 440 VAC CURRENT AT THE RATE OF 350 WATTS SQ FT; OUTSIDE DIMS 38.437 IN.,29.0 IN.,35.312,29.125 IN.; 26 BOLT HOLES,0.437 IN. DIA,THROUGH RETAINING FRAME FOR MOUNTING ON SHIPBOARD RAST CONTROL STATION"