The #30 mount set adapts specific #2 and #3 housing types to the transmitted light column of a DMIRB type Leica microscope. This mount attaches in place of a removable diaphragm module via a set screw in the microscope. The #30 mount can be attached to all shutter types (LS, VS or the CS25 Series). A clearance cutoff (1.38in/35.1mm from the aperture center) is provided with the VS series only.