"ALUMINUM,5.040 IN. OD,3.547 IN. ID,0.434 IN. THICK,18 SPANNER WRENCH NOTCHES AROUND OD,3 STEEL SHOULDERED PINS EVENLY SPACED PARALELL TO AXIS OF RING 120 DEG APART ON 4.200 IN. CIRCLE DIA,0.518 IN. DIA OF PIN SHOULDER,0.370 IN. SMALLEST DIA OF PIN BY 1.563 IN LG"