Super heavy duty feet for machines or tables. 1" threaded shafts, ball foot attachment to accommodate non-flat surfaces, weigh 3 lb 3 oz each. Rated for 18,000 lb. New cost $43 each: https://www.carrlane.com/product/leveling-feet/stud-leveling-feet/stud-leveling-feet/stud-leveling-feet-steel-zinc-plated/cl-16-slf