This is the Aluminum Two-Blade Spinner for the Great Planes / Revolver ARF (GPMA1018). / / FEATURES: Light-weight aluminum construction / Polished, brushed aluminum color / Includes spinner nut and 4x34mm screw / Designed for two-bladed props / / INCLUDES: One two-blade aluminum spinner / One aluminum backplate / One spinner nut / / REQUIRES: Installation on the Revolver / / SPECS: Spinner Backplate Diameter: 3-1/4" (82mm) / Spinner Backplate Mounting Ring Thickness: 3/16" (4mm) / Spinner Backplate Hole Diameter: .31"(8mm) / Length From Back Of Backplate To Front Of Cone: 3.38" (86mm) / / tlw 8/8/07 / ir/jxs