Clamps and connectors milled and turned to hold round tube exactly where your assembly needs it.
Tube is cheap, standard and everywhere. What is never standard is how you have to hold it: the diameter you actually bought, the access you actually have, and whether the tube can be lifted out or is trapped in place. These parts are cut for one tube and one situation.

A curved saddle block that clamps a round tube down onto a flat surface with four fasteners.
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A slotted clamp block that closes around a captive tube and grips it without needing access from above.
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A flanged spigot that plugs into a tube end and gives the assembly a shoulder to register against.
View The PartAttach the print and say what the part fits against. Tolerances that look tighter than the function needs get raised before you are quoted for them.
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