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While not actually made of Teflon, this tool is often called the Teflon "hard-card" or "edge tool." It is an essential tool for every installer in every installation situation. When wrapped in a layer of cotton fabric or lint-free paper towel, it is used for a) cleaning into corners and along edge gaskets (during glass preparation), b) wicking water out along borders (after an installation). Moreover, it can be used for c) direct squeegeeing of film along borders without any wrapping, and d) edge trimming by using it as a blade-guide, creating a uniform tiny gap between the film edge and the perimeter gasket or frame. Finally, e) it's used to retract gaskets to slip underneath. It is extremely hard, yet (if clean) will not scratch SR-coated film. Edge sharpness can be maintained by using a Hard Card Sharpener. Installers often cut down the tool beginning at the middle top in a straight line to the lower right corner. This angularity allows the tool to penetrate into corners for cleaning and squeegeeing purposes.
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good tool 
