The pinhead patented locking fastener system secures your individual bike components from theft. Unlike a conventional U-lock, which only secures your bike frame, the Pinhead component locking system locks your headset, forks and stem to your bicycle.

Available in two different sizes:- 28.6mm (by using the shim supplid with the 31.8mm), 31.8mm and 34.9mm.

To be used with pinhead seatpost lock