This is the DuBro Blue 2" Nylon Spinner for 2 Blade Props FEATURES: Red nylon construction Interchangeable nylon adapters for use on various size prop shafts INCLUDES: One 2" spinner One spinner backplate Two 4-40 nylon lock nuts Two 4-40 x 1/2" cap head screws Five nylon adapers for the following crankshaft sizes: 5/16", 9/32", 1/4", 7/32", 3/16" Instructions on header card REQUIRES: A 3/32" hex wrench for cap head screws SPECS: Length: 2-1/8" Diameter: 2" OD of spinner at rear 3/8" crankshaft hole (adjustable with included adapters) COMMENTS: Caution must be used when mounting the spinner. Failure to follow the included instructions carefully may result in injury. updt complete id tjt 072705