"ALUMINUM ALLOY MIL-A-21180 COMP A356-T61,SURFACE TREATMENT CHEMICAL FILM BPS FW4182,DIM.,2.250 IN. NOM W,2.800 IN. NOM LG,2.810 IN. NOM O/A HT,TWOTRIANGULAR UPRIGHT SECTIONS 0.880 IN. APART 0.210 IN. THK,TWO IN-LINE HOLES 0.2500 IN. DIA DRILLED THRU UPRIGHTS 2.500 IN. FROM BASE,THREE MOUNTING HOLES 0.211 IN. DIA LOCATED ON BASE CORNERS 0.380 IN. FROM EDGE W/1.500 IN. C TO C DISTANCE ALONG W AND 2.000 IN. C TO C ALONG W,LOWER RIGHT CORNER REMOVED1.940 IN. LG BY 1.000 IN. W"