Palmy Mini Aluminium Bike U-lock (5.1" X 2.95" &Phi;15mm) Pink/red (P-ES-101AL) Lightweight alloy U-locks with 2 keys included Feature a 16mm aluminum shackle, rubber coating and dust cover to protect the lock cylinder Perfect for low security situations or to be used in conj unction with a heavier duty lock Palmy Aluminum Mini U-Locks