The MasterLock 8195 Black High Security U-Bar offers maximum security with its hardened steel shackles The disc cylinder also provides a strong level of resistance to attack and prying and has a dust cover to protect the lock against the elements All Master Lock bike locks with locking mechanism have a Lifetime Warranty against mechanical failure Sold Secure Bicycle Gold certified This high level of quality is recognised by the main European testing agencies Specification Height 210mm Clearance 110mm Diameter 13mm