Springfield Marine's 3300713 Plug-In Fixed Height Locking Post features high-strength aluminum and anodized finish to help resist the harsh marine environments. Heights of locking posts are measured from top to bottom of post. This Plug-In Fixed Height Locking Post is 13" long and is compatible with Trac-Lock Locking Swivel #1100031-L. The post can also be used with any 2-3/8" Plug-In Bases (sold separately).