This base adapter, the Direct Base III is one of the most popular part to attach an arm system. It can be directly connected to the Grip Base D4, Grip Base M1 or D Holder. It can also be connected to the Direct Base III using an optional M6 Plate. You can also attach it to a M6 joint which can be screwed into the middle of the Stick Arm or Multi Ball Arm. Finally you can use it to connect directly to the underside of a strobe as well, however I do prefer to use Z adapter MV for this.
Compatible base/housing etc:
Directly attached Grip Base D4,M1, D Holder, Extension Bar, Port Arm for MRS, Port Arm for UFL-MR130 EFS60, Tripod Adapter
Attached via additional "M6 Plate Direct Base III"
Attached via additional "M5 Plate Direct Base III"
Compatible arm (Attached via optional M6 Joint)
Stick Arm XS/SS/S/M/L
Multi Ball Arm S/ML/L/LL/XL (Multi Ball Arm SS is not compatible)