"TEE BRACE ASSEMBLY USED ON LOW- IMPACT RESISTANCE STRUCTURES FOR LIGHTING SUPPORTS FOR AIRPORT APPROACHLIGHTING SYSTEMS,MODELS ALSF-2 AND MALSR. CONSTRUCTED FROM 1X1X1/8 INCH THICK WALL TUBING 4 FT,3-3/4 IN LONG WITH 1 INCH WIDE BY 3/16 INCH PLATES,2 EACH END. OVER-ALL LENGTH 4 FT 10-3/4 INCH. PER FAA SPEC.FAA-E-2702;ITEM 6, DRWG D-6155-1, ALSF-2 AND MALSR LIR STRUCTURES, STRUCTURAL CONFIGURATIONS"