Works on pool covers 10 to 24 feet wide and larger, all thicknesses from 8mm to 16mm.All brands of solar covers and all brands of rollers. A complete fixing kit to attach the pool cover or solar pool membrane to your pool roller. Flatten or roll easily For above ground pools or family pools, easily spread the pool cover or pool solar film in the pool or roll it up Suitable for all kinds of above ground swimming pools，It helps you spread the swimming pool cover or bubble wrap flat on the swimming pool, and it can also be easily rolled up and placed together. Practical and sturdy, these clips are easily installed on the swimming pool bubble cover, which is simple and quick. It helps you spread the swimming pool cover or bubble wrap flat on the swimming pool, and it can alsobe easily rolled up and placed together .