"STEPPED LAMINATE PLATE MADE OF PLOYIMIDE/QUARTZ SHEETS. 15.00 IN. LONG,0.45 IN. THICK AND 2.50 IN. WIDE. EVERY 1.50 IN. ALONG THE LENGTH WILL INTRODUCE A 0.045 IN. STEP REDUCTION IN THICKNESS. LOCATED BETWEEN THE SECOND ANDTHIRD LAMINATE PLY,AND CENTERED BELOWEACH STEP,IS A 0.50 IN. DIAMETER POLYTETRAFLUOROETHYLENE INSERT. A PROTECTIVE CARRYING CASE PROVIDED"