Abstract: A router especially adapted for cutting plastic fibrous materials cleanly. The router design is a cylindrical body having two sets of cutting edges extending the full length of the bit except for the shank. The cutting edges are helically oriented along the shaft of the router and one set of cutting edges extends helically right-handed while the other set of the cutting edges extends helically left-handed. The two cutting edges are separated by a pair of flutes or grooves diametrically opposed to each other. The cutting edges are also diametrically opposed to each other along the shaft of the cylinder. The router bit is used to trim plastic laminated materials reinforced with fibers.