Included in the package when you deliver (4 x 2" PP chair roller wheels)Ball casters Diameter: 2 inches (50MM)Its classic retro look makes it perfect for a wide variety of devices, whether it's plugged directly into an existing mounting hole or installed with a socket, it's easy and fast. Including but not limited to: dressers, toy boxes, vintage wine coolers, kitchen carts, wicker chairs, kitchen or dining chairs and other equipment.