made from double-sided melamine panel (like pegboard, but no holes), 24" wide, from lumber yard. To make it, first I lay it flat, arrange rulers for spacing & mark it. Holes were drilled through, and small nuts and bolts added to hang the rulers on. Two over-the-door brackets were atttached to the back of it. Thick felt protectors were glued at the corners on the back to protect the door when it was hung. Fastened to door with tiny finishing nails.