Specifications of our mirror as follow:
*Material:BK7 A glass, Quartz, CaF2,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
*Parallelism:1 Arc min