The FSG1050-BBAR1200/2100 from Newlight Photonics Inc is a Optical Window with Coating Wavelength 1200 to 2100 nm, Window Diameter 25.4 mm, Window Diameter 1 Inch, Thickness 5.0 mm, Thickness 0.2 Inch. More details for FSG1050-BBAR1200/2100 can be seen below.