Assembled without any tools, AMHS series plugs existing, unwanted holes in fiberglass and steel electrical enclosures. Elements of construction include low-profile interior nut and exterior plug, and products come in standard hole sizes for pilot lights, pushbuttons, and conduit fittings. Suited for chemical, water, and food industries, these enclosure hole plugs are designed for simple installation in large enclosures that can be completed by one person.