"ALUMINUM ALLOY,MIL-A-21180,A356-T61,CLASS 10,3.680 IN. LG,3.060 IN. W,IRREGULAR SHAPE,4 MTG HOLES 0.251 IN. MIN,0.258 IN. MAX DIA,IRREGULAR SPACED,1 HOLE THRU 0.515 IN. MIN,0.524 IN. MAX DIA,W/0.9391 IN. MIN,0.9399 IN. MAX DIA,0.860 IN. DEEP COUNTERBORE ON FIRST END,1.000 IN. MIN,1.030 IN. MAX DIA,0.092 IN. DEEP COUNTERBORE ON SECOND END"