"7.0 IN. THICK;FLAT BOTTOM HOLES ARE DRILLED AFTER BONDING UPPER SKIN AND PRIOR TO BONDING LOWER SKIN ON PLACE; HOLES ARE PRENDICULAR TO UPPER SKIN;UPPER AND LOWER SKIN ARE 0.200 IN THICK MS-521 GL/PI; MS-566 FILM TO SKIN; AHOLES DRILLED THROUGH CORE TO FOAM, ONE HOLE 0.75 IN DIA & SECOND HOLE 0.50 IN DIA; B HOLES DRILLED THROUGH CORE &ADHESIVE TO GL/PL SKIN, ONE HOLE 0.75 IN DIA, SECOND HOLE 0.50 IN DIA; C EQUALS 0.004 IN THICK TELFON TAPE USED TOSIMULATE EDGE DELAMINATION"