Usage Tips:New Environmental Protection Material:The connector is made of ABS high-quality environmentally protection plastic, which is non-toxic and tasteless and can be used indoors for a long time. The thick design is very durable and will not be broken. It is convenient and simple and is very suitable for home use. Stable & Firm Design:The connector has a circular surface with a diameter of 3.7 cm and a thickness of 0.5 cm. The back of the connector is a cross recess designed to securely attach the plastic panel. The internal ribbed plug-in slot design adds friction, a total of 8 card slotsand provides a more secure connection. Easy to Install & Remove:The connector is very simple to use and requires no additional tools to complete the assembly step. Insert the panel to be assembled into the slot of the connector, making sure that all rounded surfaces face outward and are balanced after installation.If you need to disassemble, you can pull it out directly. Value 20 Piece Sets:You will get 20 plastic connectors and there is no problem in completing a simple shelf connection. You can estimate the quantity you need before you buy. Wire Cube Plastic Connectors can meet your different needs, such as wardrobes, shoe cabinets, lockers. Warm Reminder:Make sure your storage shelf is Cube Storage Shelving before you buy it. (For example, the mesh grid simple storage shelf shown in the picture).Also need to make sure that the part that is connected to the connection slot matches the size of the slot (see the dimensions in the picture).