Description These CNC machined 3-blades propellers are made of aluminum alloy,used for RC racing boat,RC Yacht,RC catamaran, RC hydroplane,F1 racing etc. Anodized silver finish. It has the characteristics of high strength, dynamic balance and not easy deformation. It should works with driving dogs (not include in package) There are four sizes propellers available, please choose the correct size for your boat before pruchasing: 40mm: Rotating Diameter: 40mm, Hub Hole Diameter: 4.76mm, Hub Height: 20mm 42mm: Rotating Diameter: 42mm, Hub Hole Diameter: 4.76mm, Hub Height: 20mm 45mm: Rotating Diameter: 45mm, Hub Hole Diameter: 4.76mm, Hub Height: 22mm 50mm: Rotating Diameter: 50mm, Hub Hole Diameter: 4.76mm, Hub Height: 24mm Please Note: Right-Hand Propeller: which rotates clockwise as viewed from the stern when in forward gear Left-Hand Propeller: which rotates counter clockwise as viewed from the stern when in forward gear ? Specification & Features * Material: Aluminum alloy * Technology: CNC Machined * Pitch Ratio: 1.6 * Fits 4.76mm(3/16") drive shaft * Rotating Diameter: 40mm/42mm/45mm/50mm optional * Type: Left_hand / Right_hand optional ? Item Contains 1 piece of 3-blades aluminum propeller (size depending on you choose)