Peg for Shelf

I needed a peg that I could attached to the verticals of a shelving unit. I use one as a spool holder, and another for a headphone hook.

You will need a large zip tie or strong string or twine to secure this to the shelf vertical. The shelving style this is designed for has tubular verticals that have indentations for helping shelves grip the verticals. Typically these wire shelves are seen in stores and commercial kitchens, but the hardware store by me carries them.

I don't know how