Conical screw covers and telescopic screw covers are used to protect ball, acme, and lead screws from contaminants. Ball, acme, and lead screws are commonly used in many kinds of manufacturing machinery and engines, moving assemblies, and rotating equipment. Because these screws are used in machinery with moving parts, they are often exposed to dust and particulate matter from the machining process and must be protected from damage with flexible conical screw covers and telescopic screw covers.