Plug-In Locking Air-Ride Post - 22-3/4" to 29-1/2"Features:. Pedestals Can Be Locked In Position To Prevent Rotating Or Unlocked To Rotate Freely. Provides Safe, Stable Seating. Fits Any 2-3/8? Plug-In Base (sold separately). Rated ABYC Class H-31 B (Fishing Only)