This is the Wolf Jack: a super small deadlift jack that lets you load and unload weight more easily. It weighs less than 1.5lbs but holds up to 1100lbs of weight. It fits standard Olympic bars. It has a military grade construction and comes with a wider base for stability.
The Wolf Jack lets you change weight hands-free. It lets you use your foot and body weight to lift a fully loaded barbell off the floor.