This is a Vortech 3.5" Aluminum Parabolic Two-Blade Spinner from Dave Brown

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

INCLUDES: 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

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

SPECS:    Spinner Backplate Diameter:                       3.5" (88.9mm)
          Spinner Backplate Thickness:                     3/16"    (4mm)
          Spinner Backplate Hole Diameter:                  3/8"  (9.5mm)
          Length From Back Of Backplate To Front Of Cone:   3.5" (88.9mm)
          Weight: 5.9 oz.

COMMENTS: To Attach the Spinner to the Engine, the Modeler Must Use One of the
            Following Adapter Nut Sets.

          This spinner uses an X-LONG adapter

          Note: Use A Short Adapter With Spinners 2-1/2" And Smaller.
                Use A Long Adapter With Spinners 2-1/2" And Larger.
                Use A X-Long Adapter With Spinners 3" And Larger.
            3/8-24   DAVQ9324 (Long), DAVQ6324 (X-Long)
                       OS Max 1.08 FSR, FT-240, FT-300 and FR-300, K&B 1.00,
                       Magnum XL-180AR, Enya VT-240 Twin
            1/4-28   DAVQ8428 (Short), DAVQ9428 (Long), DAVQ6428 (X-Long)
                       OS Max .25-.60, SuperTigre .25-.60, Fox .19-.50,
                       Enya .25-.53, K&B .19-.65, OPS .40-.60, Webra .28-.80
            5/16-24  DAVQ8524 (Short), DAVQ9524 (Long), DAVQ6524 (X-Long)
                       OS Max .61-.90, SuperTigre .61-.90, Fox .60-1.2
            7x1mm  DAVQ8710 (Short), DAVQ9710 (Long),
                       Enya .35-.60, .60-1.2 Four Strokes (Non-R Engines)
            8x1mm  DAVQ8810 (Short), DAVQ9810 (Long)
                       YS .90-1.2 4-Stroke, Enya 1.2R 4-Stroke,
                       OPS Super .60 and .61 5-Port
            8x1.25mm DAVQ8812 (Short), DAVQ9812 (Long), DAVQ6812 (X-Long)
                       All YS 2-Stroke, OPS Maxi .30, Webra .61-1.2
                                                                     jmm 042402
                                                                          ir/kh