The product is a set of 4 heavy-duty bike storage hooks designed specifically for the Kobalt K-Rail hanger 103659. These hooks are made of a combination of metal, plastic, and wood, ensuring durability and stability for holding up to 1 bike each. They can be mounted on walls or ceilings, providing versatile options for storing your bikes securely. Made in the United States, these black storage hooks are a practical and reliable solution for organizing and storing your bicycles.