The Springfield Kingpin 11" Fixed Height Seat Post is built for durability. Made with high-strength aluminum, it has a satin anodized finish for lasting shine. The post's removable feature uses a 3/4" steel pin with a retention clip, fitting any standard (non-threaded) KingPin base.• Hefty 1-3/4" dia. post and reinforcement ring• Use with any KingPin seat mount (sold separately)• Use with standard 3/4" KingPin base (sold separately)• Mfr. Warranty: 5 years Hefty 1-3/4"" dia. post & reinforcement ring Use with any KingPin seat mount (sold separately) | Springfield Marine KingPin 11" Fixed Height Post, Anodized