Gladon's Gator Clip™ is simply the best one-piece cover clip available! Gator clips are used to secure winter covers. This economy clip is made from a special high-quality resin that resists cracking in cold weather and provides good holding power. The Gator Clip™ "Holds Your Pool Cover Like The Jaws of a Gator". Use three of these 5" long clips on each top rail of the pool. For maximum holding power in high wind areas, the Gladon CoverLoc™ System is recommended.