In an effort to organize and give my craft room more usable flat space, I converted the normal standing thread holders to a hanging one using magnetic hooks. My storage cabinet is made of metal. I bought it from Office Depot, its a Sandusky
a couple years ago for around $179.00. I noticed magnets stuck to it and decided to order magnetic hooks on ebay, these hooks are made to hold 20 lbs.... I wanted to be safe. This was a very simple project.
This would also work on a metal file cabinet.