The ultimate propellor protection. Not only protects swimmers and marine life from the blades but increases low speed steerability and protects the prop from floating ropes and other flotsam. Work boats have used this system for years as have dive boats and those in the vicinity of the beach. This patented system has no separate moving parts, cables or tubes so long life can be assured and it can be fitted in minutes with ordinary tools. Suitable for outboards and outdrives. 11"