The short-stem K2 rudder is used with our top race boats, such as the Mustang and Low volume Marauder. The high volume Marauder may take either the short or long stem so it's best to measure your boat first - H/V Marauders after 2012 are fitted with a long stem. The stem is approximately 13cm long from the top of the blade to the top of the thread, with a diameter of 8mm. For rudder tube length of approximately 110mm. Moulded from black plastic, these rudders are low-cost and durable.