These two Tentacle System models work the same but have different purposes. They both use 4mm hardware.

There is an pegboard hanger that provides a base. It works with any size of pegboard hooks. It can be attached to many different cylinder shapes up to about 20mm.

There is also a grip that holds anything cylindrical up to about 20mm.

You can learn all about the Tentacle System here: https://3ddoodle.com/tentacle-system/