Specifications

Material: BK7 Grade A Optical Glass
Dimension Tolerance: +/-0.2mm 
Flatness: l/4 @ 632.8 nm 
Surface Quality: 60/40 scratch and dig 
T/R: 
50/50+/-5% for natrual light
T=(Ts+Tp)/2, R=(Rs+Rp)/2
Beam Deviation: <3 arc minutes
Coatings: 
Partial reflectance: on hypotenuse face 
AR-coatings: on all input and output faces

Single wavelength or broadband spectra are both available. Other beamsplitter ratios are also available.