I had searched for a long time to find replacement brackets for a display case that I picked up used. Turned out to special Standards not so standard. They are one inch square (the standards) and shorter distance between slots than most store standards I found, 1 inch from center to center. The local stores had stuff but nothing really useable. The ones it had seemed to be older with a locking lever but those were more money for similar and after many hours of searching I thought these might fit. and they did and are great! Great Product! They also kind of click in so you know they are in good.