Therefore, the panniers can be easily switched from one bike to another. The QL2.1 system may be upgraded with the anti-theft device.Key Features:Lock and ReleaseAutomatic closing and opening of hooks by lifting the pannier handle. When the pannier is lifted by the handle, the two hooks on the reverse side are opened. Then the pannier can be hooked into the rack. Once you let go of the handle, the two hooks close around the rack tube.Lower RailThe lower hook rail is made of a two-component synthetic combination with an "Anti-Scratch" function. This reduces abrasions on the carrier and prevents damage to the rack tubing. The lower hook is rotatable in 15° steps and adjustable in height. All hooks are adjustable to the rack without requiring any tools and can be easily exchanged.Upper Rail16 mm QL hooks with inserts which have an "Anti-Scratch" function for 8, 10, and 12 mm (size 12 mm e.g., required for Racktime racks). In QL2.1, the reduction inserts are now attached from the sides and