"STEEL,MIL-S-5000,4340,SHAPE IRREGULAR,3.875 IN. LG O/A,2.750 IN. WO/A,0.182 IN. MIN,0.192 IN. MAX THK,SERRATED FOR ENTIRE WIDTH,60 DEGREEPITCH,0.026 IN. MIN,0.036 IN. MAX DEPTH OF SERRATIONS,CENTER REAM 0.437IN. MIN,0.438 IN. MAX DIA,COUNTERSINK 90 DEGREES,0.609 IN. DIA OFCOUNTERSINK,4 MOUNTING HOLES 0.261 IN. DIA,1 HOLE IN INTEGRAL PROJECTION,0.750 IN. DIA"