Folding locks, also known as link plate locks, combine near u-lock security with the ease of use and versatility of a cable lock. Remarkably compact, the K9 folding lock series is made of hardened steel plates and features OnGuard&';s pick, pull, and drill-proof Z-Cylinder key mechanism. Once unfolded, the K9 has the length to secure frames and wheels to a rack or other solid object. Included mountin bracket fits most bicycle tubes for easy transport. Combo Lock, resettable; set your own 4-digit combo Folding Lock Series Premium Hardened Link Plate Technology Includes: frame mount, mounting hardware Can mount water bottle cage on top of lock bracket Links extend to about 88.5cm (34.8")