This is a Two-piece Two-Blade White Nylon Spinner with an Aluminum Backplate.
FEATURES: No spinner nut required.
Engine shaft hole is stepped to perfectly center the opening if
englarging is needed.
Sturdy Aluminum backplate holds the spinner in round-which means
it turns truer, with less vibration.
For engines with ¼"(6mm) & 5/16"(8mm) engine shafts
INCLUDES: One White Spinner cone
One Aluminum backplate
Two 3mm x 8mm machine screws
SPECS: Spinner Diameter: 2¼"
Spinner Backplate Thickness: 1/8"
Crankshaft hole: stepped from .258"(6.5mm) to .312"(8mm)