Profile: Tri R Sales, Inc. makes machine knives and industrial saw blades. We specialize in industrial knife design. We serve industries like the rubber, tire cord, metalworking, electronics, textiles, plastics, printing/paper and foil converting. We offer carbide cutting tools and tool steel knives. We deliver special micro finishes, unique patented edges and resharpening service. Our tungsten carbide supplies wear-resistant and extremely hard material for blade, knife, saw, shear, slitter, spacer & part design.