A port arm for "MRS60 Port II", "MRS100 Port Type UII", "MRS100 Port Type UIII", "MRS50 Port for Olympus" and previous model "MRS60 Port", "MRS100 Port Type U". The diameter of an adapter ring is 85.4mm (3.4in).
Two Port Arm Adapters are designed to link to "Z Joint" or "Single Light Holder" directly or to have ball-joint adapter such as "Direct Base III" or "Z Adapter II" to create compact lighting system for a DSLR with an INON external strobe or LED light.
