The TACO Pontoon Fender Lock is designed to make docking your pontoon boat faster and easier by maintaining your fender lines at the desired length off the side of your boat. This stainless steel fitting from TACO Marine mounts on the side of your boat. The rope line remains at optimum length with the mounting pin attached to the fender. At docking, simply insert the pin into the fitting and your boat is protected from bumps and scrapes with the boat fenders in ideal position. The TACO Pontoon Fender Lock fits a 1 to 1.25 square tube with a mounting application that fastens from the bottom of the square tube. A nylon ring washer separates dissimilar metals. Button diameter: 1. Cancer and Reproductive Harm- www.P65Warnings.ca.gov.