Onsrud 54-231 Solid Carbide router 4FL 3/8 x 1-1/8 x 3 OAL For Composite, Fiberglass, 3/8 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.