Dubro spinner is constructed of red nylon. Simple, easy and safe to install, no need to use the palm of your hand. The spinner bolts to the backplate with a unique nylon insert lock-nut design, giving a solid and secure hold.
Spinner Diameter: 2-1/4
Spinner Backplate Thickness: 3/16
Crankshaft hole: 1/4" (may be reamed out to 7mm or 5/16")