1.These are after market products: Fit for yamaha 40-55hp outboard motos,13 spline tooth props,Ref No.663-45987-02 2. Outstanding Quality: Outstanding Quality based on strict quality control,same style as original ones and matched prop well ! 3.Engine Types: Please check your engine type before purchasing ;You can refer to below product description for details 4.Sold As Seen In Pictures: Hardware kits come exactly as picture showing ; Include:thrust washer,spacer,washer,nut and cotter pin 5.Service Promise: Quality and performance are guaranteed,Any questions we will give you a satisfactory answer within 24 hours.Based on your favor or need , en ingles o español！