UNIQUE COVER LOCK SYSTEM IS SUPERIOR TO ONE-PIECE CLIPS!This deluxe two-part covers lock system will not pull off 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.