If you're tired of struggling to move heavy furniture or equipment, these Hirate casters are absolute game-changers! This set of four heavy-duty wheels features 3-inch polyurethane treads that roll smoothly on any floor surface without leaving marks or scratches. The 5/16-18UNC threaded stems (important - these are imperial size, not metric M8!) make installation straightforward, and they include screw inserts for furniture mounting. Each caster has a smart locking brake that stops the wheel from rolling while still allowing the swivel function - perfect for when you need stability but might want to adjust positioning. The steel construction with precision ball bearings can handle up to 550 pounds total, so they're seriously robust. Whether you're upgrading workbenches, tool carts, speaker cabinets, or even heavy furniture like bookshelves or beds, these casters make moving heavy items effortless. The 360-degree swivel means you can maneuver in tight spaces easily. No more lifting and straining - just glide your heavy items wherever you need them!