�� Specifications:
�� Material: BK7 Grade A optical glass
�� Dimension(A) Tolerance: +0.0, -0.2 mm
�� Dimension(B) Tolerance: +/-0.3 mm
�� Dimension(h) Tolerance: +/-0.2 mm
�� Clear Aperture: >80%
�� Roof Angle Tolerance: +/- 3 arcmin
�� Flatness: ��/2 @632.8 nm
�� Surface Quality: 60-40 scratch and dig
�� Protective Bevel