What an AWESOME TOOL - DON'T KNOW HOW I DID DECKS BEFORE HAVING THIS LOL  works great to either push or pull a board straight, holds  the board in place for mounting as well. even worked great with my 2x deck board that were REALLY warped after a day in the sun, home depot boards have gotten really bad about warping, without this too there was NO WAY I could have mounted my deck boards.