"MATL 1ST LAYER GLASS/EPOXY MS-521, 2ND LAYER MS284 QUARTZ/BISHOLYIHIDE AND MS-250 GRAPHITE/BISHOLYIHIDE, 3RD LAYER AF-147 FILM ADHESIVE, 4TH LAYER HS-284 QUARTZ/BISHOLYIHIDE WITH COPPERFOIL HYBRID LAMINATE; 4 HOLES: 0.75 IN. DIA AND 0.5 IN DIA 1 IN. FROM TOP POLYTETRAFLUOROETHYLENE INSERT, 1 IN. FROM BOTTOM AND 2 IN. FROM LEFT SIDE: TWO HOLES 2.0 IN. DIA STEEL PULLOUT"