Pony pipe clamp fixtures are made with smoothly cut Acme threads.
They feature the multiple-disc clutch for secure holding.
Use with any length threaded (on one end) ¾ black pipe.
Pony #56 Clamp Fixture 2 1/2″ deep reach design $17.99
Wooden vise faces ½ Baltic Birch includes screws $4.50 per pair