ITEM HAS A SQUARE THRU HOLE FROM END-TO-END WITH MEASUREMENTS OF 0.563 TO 0.565 BY 0.563 TO 0.565. MATERIAL IS CRES 303 PER ASTM A-582. FINISH IS PASSIVATED PER MIL-STD-130. ITEM IS PAINTED ON OUTSIDE. COLOR IS GREEN 383 CHEMICAL AGENT RESISTANT COATING PER MIL-C-46168 TYPE 2