Are you looking for the strongest adjustable hitch shackle on the market? The BulletProof Extreme Duty Shackle Attachment is for you! The BulletProof Extreme Duty Adjustable Shackle Attachment. Usable with any of our hitches and can be adjusted up or down within the channel. The design makes it durable, safe, and easy to use. Unlike many of our competitors, we use solid steel to ensure maximum strength. This Adjustable Shackle has a weight rating of up to 36,000 lbs.