The adjustable feet are available with fixed base on thread or with movable base with the thread. The second one make it easier to make the height adjustment under load. Usually the set adjustable feet and threaded thin layer insert on the following product range work together. they are suitable for heavy loads.
The plastic adjustable foot with threaded thin layer insert is a set to adjust the height of your product. The dimension are based on external dimension and thickness of the tube. They are suitable for lighter loads.