51mm white nylon spinner by Great Planes

This is a two-piece two-Blade 51mm. white nylon spinner with nylon backplate. INCLUDES: one spinner cone, one backplate, two screws, instructions on header card. SPECS: spinner diameter: 51mm. - spinner backplate thickness: 1/8" - crankshaft hole: drilled for ¼" with drill guides for 7mm & 5/16". If you need a spinner for a 3/16" shaft, you will need to use a smaller spinner (the 1½" or the 1¾"), or use a Du-Bro spinner (which includes adapters for various size shafts). This is a sport plastic spinner and not designed for use with high performance engines or engines with tuned pipes. Operation above 14,000 RPM is not recommended.