A superb industrial quality brake for heavy trucks. Rapid descent with just four turns to drop 25 mm.  

These brake units will not jerk the scenery when it is positioned in view of the audience.

They can be used to anti-rake touring scenery to fit a variety of stages. Useful to level up large trucks on uneven stage floors and to raise heavy units from the floor to access pallet handling equipment.

Now fitted with a square head to fit a 19 mm socket and a black nylon foot with a bronze bush.
All parts replaceable.
Design right applies.