Replace your standard saddle or seatpost clamp bolts with these security versions for maximum theft protection. They are available in most common sizes and lengths.
Seatpost Bolts - These attach your seat to the seatpost. M8 is common for single-bolt seatposts and M5/M6 is common on double-bolt seatposts.
Seatpost Binder Bolts - Attach onto the frame providing protection for both the seatpost and saddle.