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Item #: 900 -
Snap-In Blanks Plated steel for knockouts Snap-in style knockout Blanks are inserted in discontinued, open box knockouts to protect exposed wires. They are used in standard, air tight or dust tight applications. Arlington's Snap-in Blanks seal, close and secure open knockout holes without removing box devices or covers. Available in multiple sizes ranging from 1/2" to 2".