Long days on the water shouldn't be followed by an ordeal when it's time to load your boat. Trailer guide-ons do more than help you get your boat on your trailer: they stop a multitude of loading problems from happening. Guide-ons keep you from loading too deep, keep your trailer position true and are especially helpful at night. They'll help you load faster and safer, especially at crowded launches. Constructed to withstand the harsh marine environment. Adjustable, carpet-padded bunks work on both bunk or roller-style trailer frames up to 3" wide x 4.25" tall. Intended for freshwater use only; use in saltwater or brackish water will damage the finish. 7" bolts are available for trailer frames up to 5.5" tall, see Extreme Max 3005.4050.