Invincible Marine BR54936 Seat BaseBrushed ss 7-Inchx7-Inch Made using the highest quality components Performance and quality tested The most trusted name in marine accessories and equipment Engineered to prevent unintentional detachment Reinforced with stainless steel for added strength and durability, providing you with years of dependability This plate measures 7-inches by 7-inches Accepts most -inch pin style seat extensions Comes with a 1-year warranty