"USED FOR MG-20 STRUCTURE ONLY. OVER-ALL DIM. 18-1/2 INCH LONG BY 15-1/2 INCH WIDE BY 9-1/2 INCH HIGH. GALVANIZED STEEL. PIVOTS FROM ONE SIDEAROUND 3/4 INCH DIA. AXLE BAR. ALUM. TUBE 5.980 INCH OD BY 6.0 INCH HIGH ONTOP PLATE TO MOUNT TUBE ""A"" WITH MOUNTING SOCKET ASSEMBLY. USED FOR LOW-IM- PACT RESISTANCE STRUCTURES FOR LIGHT- ING SUPPORTS FOR AIRPORT APPROACH LIGHTING SYSTEMS,MODELS ALSF-2 AND MALSR. PER FAA SPEC. FAA-E-2702;ITEM 15, DRWG D-6155-1, ALSF-2 AND MALSR LIR STRUCTURES, STRUCTURAL CONFIGURATIONS"