"STEEL PLATE 8630 MIL-S-6050 OR STEEL PLATE 4130 MIL-S-6758,TWO PARTS,ONE 6.48 IN. MIN AND 6.54 IN. MAX DIA OVERALL,MAIN PART 4.26 IN. MIN AND 4.32 IN. MAX DIA WITH THREE FLANGES. PART TWO IS 6.20 IN. DIA OVERALL,MAIN PART 4.00 IN DIA WITH THREE FLANGES EACH WITH 1.404 IN. MIN AND 1.407 IN MAX DIA. CENTER OF PART HAS THREE SLOTS 0.210 IN. MIN AND 0.220 IN. MAX EQUALLY SPACED"