3T Ionic 0 Pro Seat Post 3T-patented DiffLock splined coupling offers a secure, non-slip saddle clamp with 0.2 degree adjustment precision Fore-aft adjustment of saddle does not impact saddle angle Neat, compact design looks great, stays clean Fits 7x10 mm oval-railed saddles with oval rail end cap Replacement caps for round 7mm rails are available, all 3T seatposts comply to road and mtb usage