Bug busters hatch insect’s screens.A simple solution for no-see, mosquitos and other bugs. Installation is a cinch, just put the Bug busters over the hatch and the generous dimensions allow the hatch to open fully from inside for maximum ventilation. Features & Specs: - 100 per cent Mil Spec Polyester mesh. Lead ballasted (will not affect compass). Installs instantly over any hatch. No attachments necessary. Allows easy adjustment of hatch opening from inside. Stows in a strong plastic carrying case. Size: 12 inch x 18 inch. Just close the hatch, take measurement and add 10 to 20 per cent extra size to fit neatly. Example: A 16 inch x 20 inch hatch would use a 18 inch x 22 inch screen.