Halex 60720 Miscellaneous Accessories, 2", Silver 2-inch's long Indoor use only Use to cover exposed knock-out holes in steel outlet boxes and other metal enclosures Steel; Zinc Electro-Plate 15 Pieces per box For indoors or outdoors Use to cover exposed knock-out holes in steel outlet boxes and other metal enclosures Steel 2-Inch trade size 2.688-Inch x 0.375-Inch dimensions