... components for customer special use MaterialBK7 etc optical glass to IR CaF2,MgF2,Ge,ZnSe,Mono Si,ZnS,quartz, Sapphire,etc ... minutesClear aperture> 90%Edges Ground, Maximum 0.25mm Edge ChipCoatingUncoated, AR, HR, PR coating, etc. Appearance Restangular,square,circle,wedge,oval etc .