Simple, easy and safe to install. Each Spinner comes with 4 shaft adapters. (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: 2.5 inches (63.49 mm) at base.
Length: 2.5 inches (63.49 mm) from baseplate to tip.