Connector measurement: the connector size is 3.6 cm/ 1.42 inch in diameter, 0.4 cm/ 0.16 inch in inner width, standard size fits for most closet Convenient to use: inset all panels into the connector and make sure all the circular surface toward outside, keep the shelves balance after installation Fit for: each connector has 8 slots for meeting your various needs, compatible with wire cube, modular closet, wire shelving units and so on Durable material: made of quality plastic material, durable and sturdy, would not break and can serve for a long time use Package includes: you will receive some pieces of plastic connectors, enough quantity for your use and replacement, you can also share with your friends