Although each installation is unique, the screw size we recommend and provide is M5*50mm. We have found that this screw size will provide enough length to support a Spectrum, VMAX2, or Manual screen installation in most instances. For drywall installations, the Φ10*40mm wall anchors (also included) should be installed along with the M5*50mm screws. **Please not that there are many other factors to consider when installing a screen such as the location of the wall studs and thickness of the wall. Each circumstance is different. If you are unsure about the stability of the wall or ceiling in regards to the screen installation, please contact a professional installer. Elite Screens will not be held responsible or be otherwise liable for faulty installations.