Specifications are as follows:
It is made of BK7 grade A optical glass material with dimensions of +0.0/-0.2 mm . The angle of roof is ± 3 seconds while other angles are ± 3 minutes . Its flatness is λ /2 at 632.8 nm. It has a high surface quality with 60/40 scratch and dig . It has an angle tolerance of ± 3 arc minutes. The bevel is < 0.25 mmx450. The product has no coating.