Bugbusters boat hatch insects screens A simple solution for no-see-ums, mosquitos and other bugs... Installation is fast and easy, just drop the Bugbusters screens over the hatches as the small lead beads will hold them in place. No velcro, strings or frame needed, which allow you to open or close the hatch from inside. The original, long lasting UV grade Polyester mesh, not a copy! Features & Specs: Installs instantly over any hatch, just drop it over the hatch Easy open or close the hatch from inside Nothing to fix, no velcro, frame or stings attached 24 Very small Holes/Inch or about 1mm size, No-See-Um proof 100% UV resist Polyester mesh, military spec, US made Strong UV resist Polyester thread Lead ballasted (will not affect compass) Measurements: Just close the hatch, take outside measurement and add one inch (2,5cm) on each side to fit neatly. Example: A 16" x 20" hatch would preferably use a 18" x 22" screen. You can use up to 25% bigger size if you want too.