●[Specifications] Product Name: RC Airplane Propellers; Material: Plastic; Color: Black ●(Size) Hole Diameter: 0.2 inches (4 mm); Diameter: 2.0 inches (52 mm); Blade: 0.1 inch (3 mm); Paddle: Positive ●【Advantages】This RC boat propeller is small and lightweight, so it is not very burden on your boat and can be operated safely ●【Easy Installation】Made of superior plastic material, sturdy and durable. Fluidation propellers are easy to install and will not fall off easily once installed ●【Application】RC propellers have strong thrust and the propellers can be used for RC underwater boats. Widely used in RC airplanes, excellent post replacement