AS050, Seal extra pushbutton holes, conduit openings and knockout openings against dust, dirt, oil and water with Hoffman HOL-SEALERS™. Seals will cover any size or shape of hole from .19-in. diameter to maximum diameter shown in table. AS050 Can be used on enclosure walls up to .31-in. (8-mm) thick. Features: Available in multiple colors and sizes, Oil-resistant gasket provided. Specifications: Steel Models: 16 gauge galvanized steel backplate, Plated stud (10-32x5/8) and wing nut, Stainless Steel Models, 16 gauge stainless steel backplate, Seal, backplate, stud (10-24x5/8) and wing nut are 300 series stainless steel. Finish: Steel seals have polyester powder paint finish over galvanized front surface. Stainless steel seals have polished front surface.