Invisiseamer this tool allows the carpet fitter to produce a very accurate seam in carpet.
the invisiseamer guides the hooked blade at the correct cutting angle in order to allow the carpet pile to join without leaving a visible line on the carpet surface when heat seamed together. this is the perfect tool for border work.

Take a look at this review of the invisiseamer tool https://www.youtube.com/watch?v=l8JNgEWuYws