Worn, broken or lost mounting hooks? Replace your QL2.1 hooks with a new set of QL2.1 hooks and plastic handle.For all models with the QL2/ QL2.1 system, except for ORTLIEB Office-Bag. For all models with the QL2/ QL2.1 system, except for ORTLIEB Office-Bag.Worn, broken or lost mounting hooks? Replace your QL2.1 hooks with a new set of QL2.1 hooks and plastic handle.If the new hooks are too loose on your bike rack, use the appropriate hook inserts for a snug fit. FURTHER DETAILS: + 2 QL2.1 hooks (16 mm) with plastic handle+ 1 pair each of hook inserts in sizes 8 mm, 10 mm and 12 mm