This is a Vortech 6" Aluminum Parabolic Two-Blade Spinner from Dave Brown.
FEATURES: Lightweight aluminum CNC construction
Polished, brushed aluminum color
Includes four plastic backplate bushings, so the backplate will fit
securely around any ordinary crankshaft
INCLUDES: One Two-Blade Aluminum Spinner (For Sizes See SPECS)
One Aluminum Backplate
One 10-32 x 2" Cap Head Mounting Bolt
Four Plastic Backplate Adapter Bushings
One Instruction/Information Header Card
REQUIRES: Vortech Adapter Nut (See COMMENTS)
4mm or 5/32" Hex Wrench (For The Cap Screw)
SPECS: Spinner Backplate Diameter: 6" (152mm)
Spinner Backplate Thickness: 3/16" (4mm)
Spinner Backplate Hole Diameter: 3/8" (9.5mm)
Length From Back Of Backplate To Front Of Cone: 5.6" (143mm)
Weight: 13.7oz. (385g)