Onsrud 54-221 Solid Carbide router 4FL 1/4 x 3/4 x 2-1/2 OAL For Composite, Fiberglass, 1/4 Shank, Fet2 Coated

Three and four flute tools for machining glass-reinforced plastic. Geometry has been optimized to shear the glass fibers while creating a chip which removes heat from the cut to avoid melting of the material.