For attaching panniers that use pannier straps to rear Bike Racks that do not have a lower hook.
These hooks mount right under the bolt that attaches your rack to the bicycle's dropout and provide a nice accessible spot for lower pannier straps.
Sold in packs of 2 hooks.
Tubus Mid-Fork Eyelets for Tara and Ergo
Racktime Topit Front Rack
Banjo Brothers Rack Top Bag