... :20mm-99mm Structure:Float glass+PVB film+PC sheet Ballistic glassAccording to (NIJ0108.01,UL752,ASTM1233,BS5051,DIN52290,UN19187 ... ,and other safe place.Specifications: Protection levelBallistic performanceGlass ThicknessGlassDensityNIJ IIIA.44 Magnum20mm51kg/ m29mm FMJNIJ III7.62x51mm NATO(M-14 ... AP7.62x54mm API52mm118kg/ m2Machine gun12.7mm AP99mm240kg/ m2 Ballistic glass (NIJ 0108.01,ASTM1233)