This is a Vortech 2" Aluminum Two-Blade Spinner from Dave Brown.
FEATURES: Light-Weight Aluminum Construction
Polished Aluminum Color
Includes Four Plastic Backplate Bushings, So The Backplate Will Fit
Securely Around Any Ordinary Crankshaft
Designed for Two-Bladed Props
INCLUDES: One Two-Blade Aluminum Spinner and Backplate
One 5x12mm Cap Screw
Four Plastic Backplate Adapter Bushings
REQUIRES: Vortech Adapter Nut (see COMMENTS)
4mm Allen Wrench (for the cap screw)
SPECS: Width: 2"