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*Material:BK7 A glass, Quartz, CaF2,ZnSe,Optical crystals or others*Parallelism:1 Arc min
*Clear Apenture:90%
*Squares/Rectangles:1mm to110mm+/-0.2mm
*Center thickness tolerance:+/-0.1mm
*Surface quality:60-40 to 20/10 Scratch/Dig
*Surface flatness:lambda/10 at 632.8nm
