This is a Two-piece Two-Blade 2" Black Nylon Spinner with a Nylon Backplate INCLUDES: One spinner cone One backplate Two 3/32 x 6/32 S/T screws Instructions on header card SPECS: Spinner Diameter: 2" Spinner Backplate Thickness: 1/8" Crankshaft hole: Drilled for ¼" with drill guides for 7mm & 5/16" COMMENTS: Instructions state that 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. If you need a spinner for a 3/16" shaft, you will need to use a smaller spinner (either the 1½" or the 1¾") or use a Du-Bro spinner which includes adapters for various size shafts. NNA-6/14/94 ir/jl instructions, 3/16" shaft info, Dubro, & "drilled for" updt tjt 072705