If you're wanting to link together a round tube or post together, a round to round hinge is what you're looking for. We can attach almost any tube/post — whether it be them having the same nominal bore (nb) or differing ones, so there's little reason to worry about not finding the one you need. Our hinges come in a variety of designs and in different materials. We have them in sturdy galvanised steel and high-quality plastic. We even have self-closing ones! So browse through our options and connect those tubes/posts.