It works by moving a blade down across a fixed blade to shear the material. For larger shears the moving blade may be set on an angle or "rocked" in order to shear the material progressively from one side to the other; this angle is referred to as the shear angle.
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Popular brands of Flooring Shear Blades available at Prefloortools.com include Bullet, Roberts, D-Cut, Crain, Gundlach, Marshalltown and Tego