"STEEL ANGLE,C/O,THREE PIECES OF STEEL PLATE WELDED TO THE OUTSIDESURFACE OF THE ANGLE IRON ASSEMBLY,APPROX 30-1/2 IN. FROM EACH END,AND THECENTER PLATE IS LOCATED APPROX 8 FT 4 IN. FROM EACH END,WELDED PLATE DIM.THREE PIECES,3 IN. W,1/2 IN. THK,8-1/2 IN. LG,O/A DIM.,6 BY 6 IN.ANGLE,1/2 IN. THK,17 FT 4-1/2 IN. LG,DRILLED FOR MTG"