To use with R2 rings in combination with the LMB 4x5 15 mm LWS console or with R11 clamp-on rings (Ø 143 mm to…mm). The LMB 4x5 15 mm LWS console can be mounted either on top or at the bottom – compatible with LMB 4x5, LMB-5, LMB-15, and LMB-25.