This set of 4 heavy-duty bench casters comes with dual locking functionality. The dual lock ensures that when locking the cart wheels and the plate, it provides double safety, especially when heavy goods are placed on an abrupt slope. The 5 in. casters can rotate 360°, allowing the wheels to roll freely at any angle when unlocked. These casters are safe for various floor surfaces, including hardwood, laminate, tile, slate, and carpets. They roll smoothly and silently without leaving any marks or scratches. They're also suitable for damp workshops or outdoor storage. The caster wheels are made of high-quality PVC rubber with a steel structure that can absorb shock and vibrations. They have no smell and are easy to move even when carrying heavy loads. Each caster can withstand 550 lbs. with a total capacity of 2200 lbs. The plate size is 3.66 in. (93mm) x 2.44 in. (62mm), and the wheel width is 32mm. They are easy to transport and have a wide range of applications, such as on lumber storage racks, furniture, and workbenches. Installation is easy as the set comes with 4 swivel casters, 16 screws, 16 washers, 16 bolts, 16 nuts, and 2 spanners, suitable for different installation methods. Color: Black.