Works with the 3/16" thick clear tempered glass panels (sold separately). Each plastic lexan connector taps into place with a rubber mallet (not included) on edge of glass panels for easy assembly of glass cube merchandisers. Clear plastic clips will not relax their grip, and will not discolor. Use the four-way connectors to join four pieces of tempered glass panels together (at the front and back of each glass panel). Four-way connectors are typically used to join the interior tempered glass panels together, on the "inside" or "middle" area of glass cube merchandisers.