"MATL STEEL PER MIL-S-6098 PER AMS6320; HEAT TREATMENT ROCKWELL C 26-33;OUTSIDE DIA MIN 2.230 IN MAX 2.240 IN. ; WIDTH 0.850 IN.; FIRST SIDE CENTER HOLE 1.230 IN. DIA,RECESS DEPTH 1.230 IN.; 2ND SIDE CENTER HOLE MIN 1.153 IN. MAX 1.155 IN. DIA,RECESS DEPTH OF 0.420 IN."