The Dinkum Systems 1" Spring Clamp for Dinkum Adjustable Arms clamps onto various surfaces to serve as a mounting base for Dinkum arms. It accepts specifically the female ends of these arms, the wider ends at the bottom; and it's compatible with all the arms except the COMPACT Lens Shades.
At the squeeze of its handles, you can clamp it onto anything as thick as an inch, including a rod, and at a very strong squeeze to anything as thick as an inch and a half. Then just attach your Dinkum arm to the round socket up-top. The clamping teeth have rubber tips to protect whatever you clamp. The circular jaw is padded to likewise protect. And the handles are ridged for a comfortable grip.
For a base for the male ends of Dinkum arms, please check out the Dinkum Clamping Top.