Plug-In Locking Air-Ride Post - 14-1/4" to 21"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(TM) Base (sold separately) Rated ABYC Class H-31 B (Fishing Only) WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.