"INVESTMENT CASTING A356 MIL-A-21180 GRADE B,HARD ANODIZE AIRESEARCH EMS 52401,TY II,CL B EXCEPT THREADS,BRIWELL HARDNESS 65.0 TO 100.0,1.440 IN. MIN 1.451 IN. MAX LG,0.580 IN. DIA,1 HOLE 0.3792 IN. MIN 0.3749 IN. MAX DIA THRU,1 HOLE 0.1867 IN. MIN 0.1874 IN. MAX DIA THRU 2 WALLS"