For all models with the QL2.1 system except for: Office-Bag Commuter-Bag Commuter-Bag Two & Downtown Two Worn broken or lost mounting hooks? Replace your QL2.1 hooks with a new set of QL2.1 hooks & plastic handle. If the new hooks are too loose on your bike rack use the appropriate hook inserts for a snug fit. Included: + 2 QL2.1 hooks (16 mm) with plastic handle+ 1 pair each of hook inserts in sizes 8 mm 10 mm & 12 mm More Information COLOR black BAG TYPE single ADAPTER Quick-Lock 2.1