Apparently if you need more than three clips on the brush you have to use plastic which I didn't want to do. So I was thrilled when I stumbled across this configuration. As you can see from the attached picture, I needed 4 holders because I wanted to use them to keep my vacuum cleaner attachments in a clutter-free and easy-to-access area. I'm not sure I'll be using hooks, they're just a bonus from what I understand. Stainless steel material is durable and strong. The black rubber coatings on the teeth are also thick and durable. The pins themselves can be "adjusted" by either bending them closer together or pushing them out a bit to fit a larger tube (which I had to do as they were positioned for smaller treated items and not wider vacuum nozzles). The pins are spaced 2 inches apart on the back, allowing you to attach a handle up to 2 inches in diameter. Rubber tips ensure items are held securely in place, whether the pins are spaced apart or pressed tightly together!