aka a sash clamp. One jaw is attached to a threaded rod that passes through a plate at the end of a metal bar, while the other jaw slides along the bar and locks in place. Woodworkers use bar ...

threaded rod, tensioned with 1/4-in. fender washers and nuts. You'll love this bar clamp rack because you can holster your pony clamps securely without tightening the lower jaw against the rack.