"2 FLANGES,1 TRIANGLE SHAPE W/3 0.378 IN. DIA HOLES ON A 5.187 IN. DIA BC;1 HEX. SHAPE W/6 0.252 IN. DIA HOLES ON A 4.250 IN. DIA BC.FLANGE THKNS IS 0.1500 INCHES MINIMUM AND 0.1550 INCHES MAXIMUM. BORE LENGTH IS 1.785 INCHES NOMINAL. HUB LENGTH IS 1.905 INCHES NOMINAL.HUB O.D. IS 1.910 INCHES NOMINAL."