The #22 mount set adapts specific #2 shutter housing types to a Nikon type microscope configured with the Nikon SB-X1 and the SB-X2 mounts. Once the #22 mounts are fitted with the SB-X1 and the SB-X2 mounts, no modification to the microscope should be necessary. The #22 mount set can be attached to all shutter types (LS or VS - excluding the CS45). A clearance cutoff (1.38in/35.1mm from aperture center) is provided with the VS series only.