1 1/4" Square Rail Mount243Provides verstile mounting without having to drill more holes in your boat. Perfect for boats with limited mounting surfaces. Stainless steel fasteners (included) hold this tough mount securely in place works with all Scotty post mount rod holders.Fits 1 1/4" square railsWARNING: This product can expose you to chemicals including NICKEL (METALLIC) which is known to the State of California to cause cancer. For more information go to P65Warnings.ca.gov.