Made of an aluminium anodized liner and chromium plated stem, these cilinders will give you trouble free operation under all circumstances. The cylinders are balanced. This means the numers of turns of the steering wheel lock-to-lock is equal port to starboard and vice-versa.
To determine the size of cilinder needed your dealer can give you advise based on the ruddersize and boat dimensions of your boat . Boatspeed is also a factor to take into consideration, as is the condition of the sea you wish to sail in.