Above ground swimming pool covers benefit greatly from pool cover clips. Using cover clips ensures that your winter cover is held tightly in place regardless of how windy or harsh the weather gets. Handy plastic fasteners grip the top rail holding your cover firmly in place like a clothespin. Use two clips per every top railing between two vertical upright supports. Sold in a pack of 20, each clip measures 5 1/4 inches long. Fits all steel and most resin pool ledges. Not for use with tubular Intex Pools.