SmallRig 15mm Rod Clamp 1493
Screw slot allows attaching to 1/4" holes.
Material: aluminum alloy
1x hex spanner
2x 1/4'' screw
It cannot be underestimated just because of its small size. It could be mounted on the top of cage via the slot, and then it could be mounted with 15mm rod for external mountings. It is of good quality and light weight. I would like to give it a thumb-up!