THE DIY "BAG-TO-BIKE" SOLUTION: Breathe new life into your gear. These professional-mounting hooks allow you to convert your favorite backpack, tote, or messenger bag into a functioning bicycle pannier. It is also the perfect cost-effective repair kit for replacing broken or brittle hooks on your existing panniers. FITS STANDARD RACKS (UP TO 13MM): Precision molded for a secure snap-fit. These hooks are designed for rear carrier racks with a tubing diameter of up to 13mm (0.5 inches). Please measure your rack tubing with a caliper before purchase to ensure these hooks will fit. INDUSTRIAL STRENGTH NYLON 6: We use Nylon 6, an engineering-thermoplastic known for its high tensile strength, impact resistance, and ability to withstand road vibration without cracking. COMPLETE MOUNTING HARDWARE: Ready to install right out of the . The kit includes 2 Upper Hooks along with 4 Bolts and 4 Nuts. We also include a backing cushion to ensure the metal hardware doesn't abrade or damage the fabric inside your bag. SIMPLE 2-BOLT INSTALLATION: No complex rail systems required. Simply mark your spacing, create small holes in your bag (and stiffener panel), and bolt the hooks directly to the fabric. This allows for fully customizable spacing to match the unique width of your specific bike rack.