Wheel Dia: 50mm / 2inch ; Capacity: 60kg / 132lb per wheel ; Style: Swivel with Brake. Thread Dia: 9.7mm / 0.38inch ; Thread Length: 25mm / 0.98inch; Wheel Material: Polyurethane. Install Type: Threaded Stem ; Color: Black ; Package Content: 4 x Swivel Caster. Polyurethane (PU) wheels offer the elasticity of rubber wheels combined with the toughness and durability of metal wheels. Suitable for all floor types. Perfect casters for small equipment and small space furniture including coffee table, plant stands, bookshelves, shoe bins, shopping carts, workbench.