"ITEM IS QUADRILATERAL SHAPED AND HAS CORROSION RESISTANT STEEL FRAMES,RETAINING AND MAIN,HOLDING A SINGLE PANE OF 2-PLY,0.50 IN. THICK,ELECTRICALLY HEATED GLASS WITH NEOPRENE GLAZING GASKET AND AN ELECTRICAL PLUG WITH CLAMP THAT SUPPLIES 440 VAC CURRENT AT THE RATE OF 350 WATTS PER SQ FT; OUTSIDE DIMS 36.125 IN.,30.375 IN.,27.0 IN.,29.0 IN.; 24 THROUGH BOLT HOLES ONRETAINING FRAME; FOR RAST CONTROL STATION SHIPBOARD"