This is an original design of SMALLRIG Cold Shoe Mounting Spud 1603
This is a cold shoe mounting spud with 3/8'' thread on one end.
It comes with standard 15mm(diameter) Rod portion (22mm long) with female 3/8'' thread, so the spud inserts into a 15mm clamp, just like a 15mm rod inserts into and gets tightened in such an opening, it can also mount on to standard male 3/8'' screw. Either way, once the spud is attached on something, you can mount various cold shoe accessories on it.
We are collecting ideas on it, welcome to co-design with us!