"C/O 1 PLATE ALUMINUM ALLOY 2024-T3;0.090 IN THK;2.312 IN LG;1.093 IN W;ALL 4 CORNERS ARE TAPER CUT 30 DEG FROM VERTICAL;4 DRILLED HOLES EA CORNER,0.094 IN DIA;4DRILLED HOLES,0.250 IN DIA;4 THREADED HOLES,SERIES 4-40 UNC-2B,ARRANGED IN A DIAMOND CONFIGURATION,AROUND CENTER POINT,LG BETWEEN CENTERS EA HOLE-0.500IN;ITEM IS BOTTOM GEAR PLATE FOR ATTITUDE DIRECTION INDICATOR,P/N HS070D5139-1"