Feature:1. Secure Fit: The seat base fits standard 3/4 inch pin posts socket with 6 screw holes, effectively dispersing the anchor points, plastic inserts for adjustable snug fit.2. Essential Function: Designed to help you easily and conveniently install bases on the boat, suitable for most boat seats, adding fun and reliable guard to your water activities.3. Easy to Install: Simple structure for easy assembly and disassembly, stable and reliable by passing the central column and 6 screws (not included) through the plate.4. Aluminum Alloy: Made of high grade aluminum alloy, with high strength, wear resistance, and oxidation resistance, suitable for various harsh environments.5. Compact Structure: The boat seat base is compact and lightweight, making it easy to install and replace, permitting a direct swap with old or damaged marine parts.Specification:Item Type: Boat Seat Mount BaseMaterial: Aluminum AlloyColor: GreySize: Approx. 7x7 inches / 17.78x17.78 cm.Package List:1 x Seat Base