This is a Vortech 4" Aluminum Parabolic Two-Blade Spinner from Dave Brown

Product Features

    Light-Weight Aluminum Construction.
    Polished, Brushed Aluminum Color.
    Includes Four Plastic Backplate Bushings, So The Backplate Will Fit Securely Around Any Ordinary Crankshaft.
    Designed for Two-Bladed Props.

Product Specifications

    Spinner Backplate Diameter: 4" (102mm)
    Spinner Backplate Thickness: 3/16" (4mm)
    Spinner Backplate Hole Diameter: 3/8" (9.5mm)
    Length From Back Of Backplate To Front Of Cone: 4.25" (110mm)
    Weight: 5.9 oz.

What's Included

    One Two-Blade Aluminum Spinner (For Sizes See SPECS)
    One Aluminum Backplate
    One 10-32 x 1" Cap Head Mounting Bolt
    Four Plastic Backplate Adapter Bushings
    One Instruction/Information Header Card

Requirements & Suggestions

    Vortech Adapter Nut
    4mm or 5/32" Allen Wrench (For The Cap Screw)