Basic raw materials - 20 or 25mm RHS and metal packing strapping

Cut off some lengths of RHS - 20mm or so

The basic components - you will also need some 6mm or so round bar / rod

Here's the clamp in action

The clamp with the keeper inserted

... and the underside of the clamp.

I used a magnetic clamp to hold the strapping into the screw for welding

You will need to drill a hole in the strapping and also cut a slot in the RHS.

The final assembled clamp

To remove the clamps after welding simply loosen the clamps and slide out the keeper and the clamp will slide back through the slot

Use them together to hold panels in place

I made a few of these

I used my TIG to weld these but a mig or gas turned down low will work equally as well