ZipWall Self-Adhesive Zippers allow you to quickly create a doorway in plastic dust barriers, providing easy entry and exit. Simply remove the paper backing and stick the zipper to the plastic barrier. Then open the zipper and cut the plastic to make a door. Heavy-duty zippers have a greater adhesive area that allows for an aggressive tackTheir 3” wide all-cloth construction provides maximum durability, making them ideal for high-traffic areas. . Work in temperatures below 55? F (12.8? C). All ZipWall zippers come with flap hooks that easily hold a door flap open. ZipWall Heavy-Duty Zipper 2-Pack contains two zippers, two flap hooks and one ZipperKnife sheeting cutter. This patented knife cuts plastic sheeting and prevents edges from jamming teeth.