Built for scaffolding, dollies, and equipment stands, this set of four 5-inch swivel casters mounts with a 1.26-inch square stem instead of a top plate, making it a direct fit for frames designed around that stem size. The non-marking rubber wheels absorb shock and roll quietly, and the top plate spins a full 360 degrees on steel balls for easy repositioning under load. A double lock mechanism secures the wheel and the swivel together, which is what keeps a loaded scaffold tower or equipment cart from rolling once it's in position. Each caster is rated for 440 lbs, and the thickened galvanized steel bracket resists corrosion so the casters hold up to repeated setup and teardown outdoors or in a busy shop. At 8.64 kg for the set of four, they're suited to flight cases, display equipment, light machinery, and furniture that needs occasional mobility.