The Cranky Horse Swivel comes with 5 in. Power Lag Hex Drive Bolts, that will do the job of holding your Swivel safe, and secure.
But, if you feel that the post that you are using may have an intergrety isssue and you will feel better with using longer bolts, then here we offer you the solution with the 6 in. bolts. All of our Power Lags come with Washer Heads, and are highly corrosion resistant.