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 high-precision mechanical parts. Plastic sheets and films supply material for injection molding, machining, packaging, construction, and signs. Plastic tubes are electrical insulators and protect items that are housed within them. Plastic rods are stiff, straight, and durable. Plastic discs are cylindrical shapes of material that are commonly fabricated into high-precision parts.