Tamper Pruf Screws Inc. manufactures a wide range of tamper-resistant screws. The Tamper Pruf catalogue of products includes a wide variety of machine screws and sheet metal screws in different head types (round head, flat head and pan head). These screws are corrosion-resistant and designed to prevent vandalism and theft as they can only be removed with their matching screwdrivers. The company also offers a variety of one-way tamper-proof screws for permanent installations. These Tamper Pruf machine screws are available in different driver sizes, head diameters, lengths and materials.