�� Specifications:
�� Material: Magnesium Fluoride single crystal
�� Diameter Tolerance: +0.0, -0.1mm,
�� Thickness Tolerance: +/-0.2mm
�� Clear Aperture: >80%
�� Parallelism: 1 arc minute
�� Flatness: ��/2 at 632.8 nm
�� Surface quality: 40-20 scratch and dig
�� Protective Bevel