"ALLOY STEEL COMP 1141 HEAT TREAT QUENCH AND TEMPER TO ROCKWELL C 26-32,8.750 IN. OUTER DIA,7.500 IN. DIA CENTER OF 20 HOLES DRILL 0.750 DIA THRU COUNTERBORE 1.094 DIA TO DIMENSION SHOW 20 HOLES EQUALLY SPACED,1.159 IN. BETWEEN EACH HOLE,INNER DIA EQUALS 5.197 IN. DIA,0.750 IN. W"