The Deck Jig� Spacer Rings from Kreg ensures a consistent 1/4 inches (6mm) spacing between the deck boards while driving screws to secure the board. It also provides proper clearance between boards for drilling with a deck jig. These Kreg deck spacers make sure there is adequate airflow and drainage for the longevity of the deck. Built with easy grab ring, these durable plastic spacer rings rest securely between the deck boards during installation. It is a perfect tool to work with Kreg Deck Jig�.