Premium Material: The manual propeller is made of steel and nylon material, designed with added thickness for protection, reliable, sturdy, lightweight and long term use.Product Size: The hand push oar propeller is with the main tube diameter of 2.5cm, propeller blade of 13cm, propeller shaft hole diameter of 1.1cm, height of 60cm/23.62inch and width of 64.5cm/25.39inch.Adjustable Clamp: This hand cranked propulsion device comes with an adjustable clamp that can be adjusted from 1.5cm to 5cm in width, making it suitable for a wide range of applications.Hand Cranked Gearbox: The hand operated boat propeller features a hand cranked gearbox with a rotation ratio of 3:1/fw.Adjustable Features: The hand manual propeller offers two levels of adjustment to meet the tilting needs of different boats and also allows for direction adjustment for better control and maneuverability. Specification: Material:Steel Nylon Size Chart: Height: 60cm/23.62inchWidth: 64.5cm/25.39inch Package Includes: 1 Set Hand Operated Boat Propeller Note: Please allow slightly errors 1-2cm differences due to manual measurement.