This is a Vortech 3-1/4" Aluminum Big Cut 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 1.35" Cap Head Mounting Bolt
          Four Plastic Backplate Adapter Bushings
          One Instruction/Information Header Card

SPECS:    Spinner Backplate Diameter:                     3-1/4" (82.55mm)
          Spinner Backplate Thickness:                     .33" (8.5mm)
          Spinner Backplate Hole Diameter:                  .57" (14.5mm)
          Length From Back Of Backplate To Front Of Cone: 3.32" (84.4mm)
           Weight: 3.53 oz. (100g)

COMMENTS: To Attach the Spinner to the Engine, the Modeler Must Use One of the
            Following Adapter Nut Sets.
          This spinner uses a 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.
            1/4-28  DAVQ8428 (Short), DAVQ9428 (Long),
                      OS Max .25-.60,R, Como .19-.61, Enya .25-.53,Fox .19-.50
                      HP .21-.61, Irvine .20-.61, K&B .19-.65, OPS .40-.60,
                      Peco .21-.45, ST .25-.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
            7x1.0mm  DAVQ8710 (Short), DAVQ9710 (Long)
                       Enya .35-.60, .60-1.2 Four Strokes (Non-R Engines)

                                                                   lmm 12/18/08
                                                                         ir/jxs