APC Thin-Electric Series props offer high efficiency and great value for your electric powered models. The center hole of the prop is designed to accept a reducing bushing to fit your propeller shaft. Included with the prop are 5 bushings to fit 1/8", 4mm, 5mm, 6mm, and 5/16" shafts.
According to the widely accepted Maximum RPM formula of 145,000/D for APC E-Series props, the 16x4E prop should not be used over 9,062 RPM.
Hub Diameter: 1.0 in. Hub Thickness: 0.49 in. Shaft Diameter: 1/4 in. Product Weight: 1.94 oz.