"CONSISTS OF A STEEL RING FORMED OF 1.750 IN. DIA ROD,6.500 IN. ID,MK H1-B,W/U-SHAPE STEEL RING RETAINER FORMED OF 1.750 IN. DIA ROD,4.250 IN. C TO C OF LEGS,4 IN. H,MK H1-C,AND WELDED TO A STEEL PLATE 0.500 IN. THK,9 IN. BY 9 IN. SQ,W/TWO 1.187 IN.DIA,HOLES ON 4.250 IN. CENTERS,2.375 IN. FROM EA SIDE AND 4.500 IN. FROM EA END,MK H1-A,USED ON P-SERIES PONTOON"