This automatic boat latch replaces a boat roller, bow roller or boat bumper on a boat trailer. The Sport model is designed specifically for fiberglass boats or most aluminum boats that have a bow eye that is directly mounted into the boat without a mounting plate. Their can not be any mounting plate above the eye. If you have a mounting plate above the eye (typically ALUMINUM Lund and alumacraft boats) you must look up our Model L. If you have an aluminum thick eye you must look up our Model T. (see visual of models and bow eyes in the product images above). This is the SHORT HANDLE version. It will come with 2 interchangable short handles. A manual reset handle and an automatic reset handle. HOW TO USE: The RNC Automatic boat latch on Boat2Trailer is a NON corrosive fully stainless steel clamping system. It has a 1 inch thick Stoltz Polyurethane protector to give your boat the best protection. The Ramp N Clamp boat loading and boat launching system is a fast 1 bolt installation and very easy to use. Load a boat by yourself in seconds with the Boat2Trailer Latch. Back your trailer into the water. Then exit the vehicle, walk down to the doc and enter the boat. Now simply drive your boat into the trailer just above idle speed. Once you reach the Boat2Trailer Latch clamp it will automatically lock onto the eye of your boat. Once locked, you may shut down and raise the motor of your boat. Exit the boat to the dock. Now walk up to and enter the vehicle. Drive your boat and trailer forward to the dry waters edge. Now exit the vehicle and hookup your strap for safe travel. That's it. It's that simple. The automatic boat latch on Boat2Trailer Installs between a 3 - 4 1/2 roller bracket (universal). Install of the Boat2Trailer Latch is extremeley easy. It is a direct replacement for a roller or bumper on a trailer. You remove the current roller on your trailer and replace it with the Ramp N Clamp automatic boat loading system on Boat2Trailer. It's a 1 bolt install.