SilverSteer SVS helms have been specifically designed for high torque applications such as bass boats, flats boats, and boats with shallow dead rise and high horsepower.. Ball bearing piston race. Built-in lock valve for positive rudder lock. Integral relief valve for over-pressure protection 105 bar (1500 PSI). 3/4" tapered stainless steel shaft. Cast iron rotor for greater durability and longer life. Complete w/adjustable 3/8" 45 fittings