by It comes in 16 foot sections,,,,,,,cut to fit your window opening,,,,,put the glass in,,,,,then,,,,,,,you need a tool to install the locking spline to finish the job,,,,,,,kind of like a zipper,,,,,,I made a tool out of a piece of spring and zipped the spline in with some vice grips,,,,,That stuff is really called Trimlock,,,,,,they sell it in 100 foot rolls,,,,,,,
