Features: l Brand new and high quality l Easy and convenient to install and remove l Light weight and portable to carry, high quality and durability in use l High precision machining, stable and reliable l Replacement the original damaged parts, ensures long lifetime and better work performance l Nice spare parts to upgrade and modify your cars Specification: l Material: brass l Axle hole diameter: 5.5 mm l Hexagon size: 12mm l Nail inner diameter: M4 l 3 Sizes: 12/15/17mm (Optional) Packing includes: l 1 x Coupler Kit