Groover electric or manual, both have a blade design to remove a measured amount of product from each side of a seam in a vinyl floor to creating a U shaped groove design to receive a weld in order to create a homogeneous seal.
A scriber is a hand tool used in metal work to mark lines on flooring, prior to cutting. The process of using a scriber is called scribing and is just part of the process of marking out.
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Popular brands of Groover & Scribers available at Prefloortools.com include Turbo, Accutrack, Winklelman, Lister, Crain, Gundlach, Armstrong and Tego