The  Crankshaft (25mm),For 4 stroke 7 HP (170F) Petrol Power Weeder / Cultivator is a vital component that ensures secure engagement between the crankshaft and various rotating parts, such as gears and pulleys. This key plays a crucial role in transmitting torque effectively, preventing slippage during operation. Designed for durability and precision, it is essential for maintaining optimal performance in power tillers.