OJ Propellers set product standards that included quality, efficiency, durability, and customer satisfaction, as well as pride and self-satisfaction in the finished product. Their passion for creating machinery is known for its technological innovation and durability. 13X13 Nibral Four Blade Left Hand Rotation 1" OJ 4-FORCE (1216B) is a rotating fan-like structure that uses the power generated and transmitted by the vessel s primary engine to drive. It operates by converting torque to thrust engine power into action. By directing the flow of water downward and behind the blades, the operation of turning the propellers generates force. Key Features: Strong and reliable. Durable and safe to use. Engineered to last longer for years of service. Best in performance made from high-grade materials. It offered a strong, very smooth, and constant draw to the tournament towboat. Specifications: Brand: OJ Propellers SKU: 1216B UPC: 01064B Propeller Pitch:13 Rotation: Left Hand Size - 13 x 13 Number Of Blades - 4 Weight: 10.00 LBS Application - Inboard Ski, Tow, and Pleasure Boats Alternate Products SKU: "654121", "1216B" Manufacturer Part Number (MPN): 1216B