1.Great addition for pontoon/fishing/jon/bass boat deck dock seat base replaces existing boat seat & add seat on boarding, allowing you to have boat seat accessories to enjoy fishing boating time. 2.Fitment: The 7inch x 7inch boat seat pedestal is a base for mounting boat seats with standard universal non threaded 3/4inch boat seat pin post socket.Perfect boat pedestal base for most marine boat seat base to marine/fishing/bass/jon/cruising boat when playing . 3.Smooth easy to install: Drill a hole and holes to make your boat seat base pedestal fit flush to your bench or floor, then twist holes and lock the marine seat base on the deck. After seat pedestal base post is inserted into the center hole, chair/seat swivels very easily and post and out of the bracket smoothly, hold your seat steady sturdy in place. 4.Upgraded sturdy constructed boat seat mount: Our boat seat base&pedestal is made of premium aluminum Alloy with a nice gloss and has smooth edges, lighter than stainless.Our boat seat mount base has been upgraded with an additional ring of reinforcing ribs which provide stronger support for your boat seat load-bearing. Save money: Cheaper than ordering from local marine boat accessories store. Colour:Photo Color Material:Aluminum Alloy Package Contents: 1 x Boat Seat Base Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.