In this video I make some large C clamps from 10mm thick steel flat bar. These clamps have more than twice the reach of my standard 6 inch or 150mm clamps that I use most often for projects. It's good to have bigger clamps when for instance I want to glue plywood sheets together. I used M16 threaded rod for the main screws and M16 Hexagonal nuts. The wooden handles I bought from my local hardware store. The glue used for the handles was a common type of construction adhesive and the paint I used was Hammerite Smooth Black.
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https://www.youtube.com/watch?v=kC20Cb-5BnQ