Just tear off the back of the tab and apply to the broken vertical louver. It is very convenient to use. For the broken valve stem, just remove the it from the blind slat and replace with new stem. These self-adhesive blinds holder tabs are pre-coated with adhesive, which can firmly fix the blinds and are. Clean the blinds and let them dry before use to increase the adhesion of repairs. The blind repair kit includes 12 vertical blind stems and 12 sets of transparent vertical blind repair tabs, which can meet your various use and replacement needs. The vertical repair tab is about 1x1 inch, and the vertical blind stem is about 1.18 x 0.3 inches, please check the size information carefully before buying to make sure it matches your part exactly. These vertical blinds stems and tabs are designed in white and transparent color, simple and convenient, suitable for almost all colors and textures of plastic blinds.