90 degrees corner joint fixing that is typically used on a middle rail on level sites.
The through tube, shown as vertical in image, cannot be joined within the fitting.
Dimensions in image are millimetres.
This part is from the incredibly versatile range of galvanised malleable iron slip-on pipe and tube fittings produced by Interclamp.
They allow for quick and easy construction of different types of structures with the use of a simple hexagon key, rather than any complicated fixings.
Typically, these parts are used to construct hand rails and safety guardrails, but they are also suitable for a huge range of other structures such as playground equipment, shop fitting, sports practice nets, greenhouses, exhibition stands, wheelchair access ramps, and much more.