"MATL ALUMINUM ALLOY,AMS4260,356-T6; FINISH CHEM FILM; 1.380 IN. MIN LG,1.430 IN. MAX LG,0.610 IN. MIN W,0.630 IN. MAX W,0.358 IN. MIN THK,0.368 IN. MAX THK; ONE 0.406 IN. DIA HOLE THRU IRREGULARLY SPACED; TWO 2-56 UNC-3B HOLES THRU IRREGULARLY SPACED"