Material: BK7 Grade A Optical Glass
Dimension Tolerance: +0.0, -0.2 mm
Clear Aperture: >80%
Deviation: 180+/-3 arc sec (Typical)
Flatness: l/4 @632.8 nm on big surface
l/10 @632.8 nm on other surface
Surface Quality: 60-40 scratch and dig
Wavefront Distortion: L/2 @632.8
Protective Bevel

Fused silcia is also available.

AR coating or reflection coating are available upone request.