Simple, easy and safe to install. Each Spinner comes with 4 shaft bushings. (6mm, 1/4, 7mm, and 5/16). Features a unique, nylon insert lock nut design for attaching the back plate and spinner - giving a solid & secure hold. Designed with safety in mind.
Diameter: 2.0 inches (51 mm) at base.
Length: 2.0 inches (51 mm) from baseplate to tip.