Material: The Speed Bag Swivel is made of metal, heavy duty, withstands the constant punching and kicking of Speed Bag for many years, durable.Easy to Install: Complete Speed Bag mount kit for easy setup, comes with the hardware needed, saving time and energy on the installation.High Quality Swivel: with built in bearings, flexible rotation and durable.Size: The diameter of the chassis is 9.5cm/3.74inch, and the hole distance is 5cm/1.97inch. Hole diameter: 7 mmSpeed Bag Mount Hardware Kit: It is used as a professional with a speed ball stand, which is the demand for training exercises and professionals. Specification: Material: Metal Size Chart: Chassis diameter: 9.5cm/3.74inchHole spacing: 5cm/1.97inchHole diameter: 7mm Package Includes: 1x Speed Bag Swivel Note: Please allow slightly errors due to manual measurement and different monitors.