Plug-In Locking Air-Ride Post – 22-1\/4" to 29-1\/2"Features:Pedestals Can Be Locked In Position To Prevent Rotating Or Unlocked To Rotate FreelyProvides Safe, Stable SeatingFits Any 2-3\/8″ Plug-In™ 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.