If you have heavy equipment, furniture, or machinery that needs to be movable but also stable when in place, these Homend leveling casters are the perfect solution. The GD-40F model features a smart design that lets you easily roll your equipment into position, then lower the anti-vibration foot to make it completely stationary and take the weight off the wheels. Each caster handles up to 110 pounds, so with all four installed, you're looking at a 440-pound total capacity - plenty for most industrial equipment, medical machinery, electronic test equipment, or heavy furniture. The construction is really solid - carbon steel top plate, aluminum body, nylon wheels that won't mark your floors, and NBR rubber pads that are non-marking and don't have that chemical smell some rubber products have. The wheels are 1.65 inches in diameter with a 0.79 inch tread width, and they roll smoothly and quietly. The leveling extent is 10mm (about 0.39 inches), which gives you enough adjustment to handle uneven floors. The plate measures 2.17x2.17 inches with hole centers at 1.65x1.65 inches, and the overall height is 2.8 inches. Installation is straightforward with the included mounting screws, and once they're on, you'll wonder how you managed without them. Perfect for workshops, labs, offices, or any situation where you need equipment to be both mobile and stable.