8.5 mm thick locking shackle Due to the universally adjustable hole spacing (68.5-107.0 mm), the 6950M can be easily mounted on all common bicycle frames The shackle, the housing, and load-bearing parts of the locking mechanism are made from specially hardened steel Locking mechanism for easy connection of accessories within the lock housing X-Plus cylinder for extremely high protection against tampering, e.g., picking