●【Specification】Product Name: RC Airplane Propellers; Material: Plastic; Type: 4540; Color: Black ●(Size) Hole Diameter: 0.19 inches (4.8 mm); Diameter: 1.8 inches (45 mm); Pitch: 1.6 inches (40 mm); Blade: 0.08 inches (2 mm); Paddle: Positive. 3 pieces ●【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