Screw and Washer Kit (Timber and Plaster) So you’ve decided to install your Artificial Vertical Garden yourself? Designer Plants recommends using our screw and washer kit to firmly attach your green wall panel. The washer is perfectly sized to grip your artificial green wall panel to secure it directly onto your fence or wall. Screw designed to snugly fit the washer (please note the 2.5m screw may protrude through thin timber, so two washers could be used, or alternatively ensure it goes into a timber beam, or something solid). Perfect for attaching to timber, plaster, MDF, plastic or composite materials.