A grid is a system of tubes mounted 90 degrees to each other. Two aluminum tubes of 50 mm are fitted with a special clamp. This Admiral clamp will help you build a solid grid in an easy way.
The Grid bracket 90 degrees to clamp two 50mm tubes together has been updated. The updated version is slightly wider allowing you to slide the tubes in the clamp without using extra force. If you see this new version you will notice that the threaded wire is thinner, but this clamp still has the strength needed when building a grid.