Swivl-eze 1.77 Series aluminum Snap-Lock seat base plate is for use on fishing, pontoon or cruising boats to provide seat base replacement or an additional seating position for the best use of your boat. Easy to install new or as a replacement for existing seat system. Attwood develops high value, engineered marine products to make life on the water easier to enjoy. Made to meet the demands of boat builders and distribution partners, our products are extensively tested on-site in our lab to provide worry-free boating under all conditions.