You use a bench clamp to hold metal or wood in place so you can drill, cut or shape it. If you need a wider jaw capacity than a C-clamp, you reach for a bar clamp, aka a sash clamp. One jaw is ...

This is the most-used clamp in my shop because I can quickly use it one-handed, it's not fussy and can be repositioned easily ...

[Mgx3d] has done that by designing 3D printable bar clamp jaws with a quick release mechanism that can be used with standard T-slot aluminum extrusion. This allows you to create ad-hoc bar clamps ...