The Shackle 14 Iron Lock by Oxford meets the three most important requirements for a lock:High Safety: It exceeds the gold standard of Sold Secure by far as it uses a 14 mm bracket made of specially hardened steel and a body associated with a simple but powerful locking mechanism with 3 exchangeable keys.Easy to transport: Oxford has developed a unique quick-release holder, which is both robust and super lightweight and can be adapted to a variety of frame and saddle sizes.Reliable: a high-quality, oil-locked locking mechanism is protected by a rubber-sheathed body to withstand the hard conditions outdoors, which withstand locks.The lock is available in 2 sizes The length of 260 mm is a good compromise for general use, while the largest 320 mm should be large enough to cover the wheel, frame and some city furniture. This model can also be purchased with a chunky 1.8 m long cable with beads to enlarge the range.