This masking plug can be used to mask threaded and non-threaded holes. The product works with a simple insertion of the small tab end through the hole. The EPDM is flexible and will provide good sealing capabilities. Recommended for use in powder coating, liquid coating, e-coating, anodizing and plating. The masking plug will withstand 450° F (233° C). The high-grade EPDM rubber product is re-usable and will not migrate, melt or harden. These plugs have excellent chemical resistance and come in black. Please contact us to request a sample or to inquire about custom or non-listed sizes.