Abstract: An improved hand shear is provided having a wear-resistant cutting edge made of either:70% to 84.5% tungsten carbide and 15.5% to 30% cobalt; or70% to 97% tungsten carbide and 3% to 30% nickel; or94% to 99.9% by weight of tungsten carbide and nickel taken together, the ratio of tungsten carbide to nickel being 0.70:0.30 to 0.97:0.03, and 0.1% to 6% of at least one of cobalt, titanium carbide and tantalum carbide.

Abstract: An improved, wear-resistant hand shear is provided having a cutting edge which is made of either:(a) 70% to 84% of tungsten carbide, and 30% to 15.5% of cobalt; or(b) 70% to 97% of tungsten carbide, and 3% to 30% of nickel; or(c) 94% to 99.9% of tungsten carbide and nickel taken together, the ratio of tungsten carbide to nickel being 0.70:0.30 to 0.97:0.03, and 0.1% to 6% of at least one of cobalt, titanium carbide, and tantalum carbide.

Abstract: An improved cutting tool is provided, especially useful for hand shears. The cutting edge of the tool is made of a wear-resistant material of either: (a) 85% to 96% tungsten carbide and 15% to 4% cobalt, (b) 60% to 89% tungsten carbide, 4% to 28% tantalum carbide, 4% to 25% titanium carbide and 3% to 30% cobalt, or (c) 34% to 51% cobalt, 25% to 32% chromium, 14% to 21% tungsten, 2% to 4% carbon and one or more of the metals nickel, silicon, columbium, manganese and iron which, together, comprise no more than 16% of the material. For material "b", preferably the composition contains about 5% to 13% cobalt, 65% to 89% tungsten carbide, titanium carbide and tantalum carbide which, together, are present in an amount no greater than 30% of the composition of the material.

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.