This is the Du-Bro 297 Plastic Spinner 3 Black

Simple, easy and safe to install. The spinners are available in 7 sizes. Each spinner comes complete with 5 shaft adapters (5mm, 6mm, 1/4", 7mm, 5/16"). You don t have to drill out our back plates!
Features a unique nylon insert lock design for attaching the back plate and spinner - giving a solid and secure hold. Designed with safety in mind. 1/pkg.

• 3" (76.2 mm) - 69 grams