This is our clamp on Downrigger mount that makes your downrigger portable and installable on boat gunwale edges that are up to 4" inches wide with scuff/jaw guards installed and 4.5" with the scuff guards removed. The 4" clamps are unique in the market as being the widest clamp-on option available. This means you have a wider range of boats you can potentially install your downrigger on. 2.5" inches is the max you'll find from any competitor.
If your boat has a major draft angle on the sides of you boat you may also want to pick up a pair of these 15° offset jaw guards - at this link: