Using these stackable bar cradles is easy. First, find a flat and stable surface to place the base unit. Then, stack additional units on top, up to a maximum of five units high. When customizing your storage system, measure carefully to choose the right length, depth, and height for your needs. As for maintenance, wipe the cradles with a dry cloth regularly to keep the blue painted surface clean. Avoid using abrasive cleaners as they may damage the paint. Be aware that the measurements provided are approximate, so there might be slight differences in the actual product. Also, the weights shown are for shipping, so the actual weight of the loaded cradles will vary depending on what you store in them.