Do you find yourself needing a quick and simple way to trim the excess screening off your freshly constructed screen frame? This Prime-Line Screen Trimming Tool will zip down your 5/16 inch screen frame perfectly trimming the extra screening to make the screen look perfectly aligned to the window frame for smooth, professional cuts. It has a flip blade that safely switches from cutting to closed mode. This screening tool is a must have for all people wanting to make their screening repair jobs looking profession. It is quick and easy to trim the excess screen material with this lightweight and portable tool designed to help simplify screen installation.