BlueWave Pool Cover Clips are tough! They grip the top rail of your above-ground pool like a clothespin and hold your cover tightly in place. Use two clips per upright. BlueWave’s Cover Loc Jr. lock system is superior to one-piece clips. This deluxe two-part cover lock system will not pull of in the strongest winter winds. Just snap together the 5″ male and female clips and your cover will stay firmly secured. Invest in the Cover Loc Jr. and extend the life of your winter cover! Perfect for high-wind areas. Use a minimum of three clips per upright. Available in 12-packs.