These 1.0 and 1.5 inch (38 mm) diameter aluminum discs have a circular opening; they are useful for limiting the angular aperture entering a detector or monochromator. Use them with or without a diffuser. The 1.0 inch discs fit into the 7123 Optic Holder; the 1.5 inch models fit into the 6195 . Both optic holders have 1.5 Inch Series Flanges.
