Sawtooth Adjustable Metal Hangers - 1-Inch or 1.5-Inch
Whether you are just hanging a framed photo or rigging a wood and paint piece that you made recently, these metal hangers will do the trick. Measure, find the middle, place the hanger, nail it in. The package includes the nails. Can be used with "nailless" picture hangers.
It comes in two versions - large and small. The small pack has 5 hangers and the large version has 4 hangers.