Easy plug-in assembly with the tightest, most secure fit. All parts are corrosion resistant for long-lasting performance in marine environments. 2.38 diameter. This Seat Mount comes in three variations to meet your needs. Available: 3 Right Handle/Stainless 3 Forward Handle/Stainless 3 Right Handle/Plated Steel Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Bases.