This is the APC Propeller 5.5x6.5 Speed 400 Electric.Tech Specs:Hub Diameter: 0.50 in.Hub Thickness: 0.28 in.Shaft Diameter: 1/4 in.Product Weight: 0.15 oz.Includes:BladeAdapter rings

• APC Propellers 5.5X6.5 Speed 400 Electric Propeller APCLP05565E

APC Propellers 5.5X6.5 Speed 400 Electric Propeller APCLP05565EAPC Propellers