This silicone masking plug can be used to mask threaded and non-threaded holes. The silicone plug is flexible and will provide good sealing capabilities. Recommended for use in Powder Coating, Liquid Coating, E-Coating, Anodizing and Plating. The silicone masking plug will withstand 600° F (350° C). The high-grade silicone product is re-usable, will not migrate, melt or harden. Color coded for easy identification. Please contact us to request a sample or to inquire about custom or other non-listed sizes.