"NICKEL COPPER ALLOY QQ-N-281,SPLIT,16.813 IN. MIN 16.818 IN. MAX ID,18.665 IN. MIN 18.670 IN. MAX OD,0.495 IN. MIN 0.497 IN. MAX H,DRILL THRU 0.343 IN. DIA 10 HOLES COUNTER BORE 0.468 IN. DIA 0.343 IN. DEEP EQUALLY SPACED ON 18.030 IN. DIA BC,DRILL THRU AND TAP 0.312-18NC 4 HOLES SPACED ON 18.031 IN. DIA BC FOR DISASSEMBLY"