I accidentally purchased the wrong size. Set of 4. Two have been taken out of the bag. These are parts for connecting N-series frames in a row. This is the wide-frame-spacing type. By combining SGF-0093 GFun Double Connector C with GFun Frame G, slide connectors, or hinge connectors, you can create a configuration that allows GFun to expand and contract. They can also grip G-series frames (43mm type). g-fun