The new generation planetary gear rotary directional servo is designed with a more compact structure than turbine gears, with smoother push-pull performance. making the transmission smoother, load distribution more uniform, high reliability, impact resistance, and providing a smoother and more comfortable experience.This wheel is well made, sturdy and perfect for your application,and was so easy to install ,Make your boat look great.the Rotary Steering internal control line used elastic material.Output used 304 stainless steel seamless pipe and corrosion-resistant materials, control lines has longer life.Rotary Helm Steering Cable Hardware 90 Degree Bezel Kit. Traditional mechanical boat engine steering systems Suitable for most sterndrives, inboards, and power-assisted boats. Mechanical/manual steering for yachts, fishing boat, speedboat or other marine transportation. Package Content:   1 x swivel helmet  1 x 90-degree bezel kit and hardware