"1.500 IN. LG; 1.000 IN. WIDE; 0.130 IN. THK; WEB SLOT 0.540 WIDE BY 0.100 IN. LG.;TONGUE SLOT 0.890 LG,0.350 IN. WIDE; HEAT TREAT TO H1100 PER MIL-H-6875,RC 28-36.CASTING MIL-STD-2175,GRADE 3,CLASS C. FINISH: ELECTROLESS NICKEL PER MIL-C-26074,CLASS 2,.0010 TO .0015 THK"