Plastics are polymers used in applications ranging from packaging and parts fabrication to structural support and wear strips. Plastic angle stock provides support for building applications. Plastic full round, half round, channel stock, and tube stock materials serve as guides in conveyor systems and pathways in manufacturing and processing equipment. Plastic perforated sheets are used as strainers, guards, screens, and partitions. Plastic bar stock and rod stock are commonly machined into parts such as gears, rollers, bushings, and fasteners. Plastic sheets and films supply material for injection molding, machining, packaging, construction, and signs. Plastic tubes are electrical insulators and protect wires, cords, and other materials that slide through them. Plastic rods are straight and often used to build frames and structures. Plastic discs are cylindrical shapes of material that are commonly fabricated into precision parts like bushings and gears.