Boat Seat Pedestals and Bases Kit with 7-Inch x 7-Inch Base Plate,3/4" Pin Post and Pin Seat Mount Marine grade quality: Pin post Inner lining is made of nylon material with high strengthBlack E-coated 3/4" pin seat mount with spring for corrosion resistant13” high, 1.5” diameter alloy steel 3/4" boat seat pin post for sturdy and rust-free7-inch x 7-inch aluminum boat seat base plate for withstanding harsh marine conditions Boat Seat Pedestals and Bases Kit with 7-Inch x 7-Inch Base Plate,3/4" Pin Post and Pin Seat Mount Marine grade quality: Pin post Inner lining is made of nylon material with high strengthBlack E-coated 3/4" pin seat mount with spring for corrosion resistant13” high, 1.5” diameter alloy steel 3/4" boat seat pin post for sturdy and rust-free7-inch x 7-inch aluminum boat seat base plate for withstanding harsh marine conditions Add additional seats: The 3/4-inch pedestal package fits perfectly in mounting holes and boat seat extension post pole, providing extra seating on pontoon /bass/jon/fishing/cruising boat deck dock, perfect replacement for the old marine boat seat pedestal base in boat seats. Add additional seats: The 3/4-inch pedestal package fits perfectly in mounting holes and boat seat extension post pole, providing extra seating on pontoon /bass/jon/fishing/cruising boat deck dock, perfect replacement for the old marine boat seat pedestal base in boat seats. Holds seat securely: The spring structure provides additional cushioning and ensures that the seat is stable and does not wobble.Solid construction and strong bearing capacity so you don't have to worry about boat tables and chairs wobbling or making squeaky breaks, holding the marine pin seat mount base pedestal steady in place. Holds seat securely: The spring structure provides additional cushioning and ensures that the seat is stable and does not wobble.Solid construction and strong bearing capacity so you don't have to worry about boat tables and chairs wobbling or making squeaky breaks, holding the marine pin seat mount base pedestal steady in place. Warm tips: Our lock in 3/4-inch boat seat pin post is a Non-threaded steel pin.Make sure how high you want your seat to be before choosing a size.Not to be used as a helm seat and do not use at speeds above 5 miles per hour.