Matl qq-a-355 temp t3 opt: ams 4037; 0.125 alum alloy sht.; length 8.375, width 2.250 in., 0.125 in. Thk; 8 holes 0.219 in. Diameter thru, all are 0.25 in. From length and width sides, 4 are centered on a line drawn through center of length and width, 4 are 2.094 in. From length centered holes