Can be used year round in salt or fresh water. Locks in up position for cruising and down for trolling. Furnished with attaching hardware. Installs in 15 minutes. Mounts on anti-cavitation plate. Made of highest quality stainless steel and marine, clear anodized aluminum. Includes installation and operating instructions. Large troller fits I/O’s plus all outboard motors 50HP and larger. Small troller fits 50hp and smaller.