Attwood Seat Mount, Clamp-On With Swivel, Adjusts from 7 ½ inches to 18 inches, Black, Powder-Coated Aluminum

I read many reviews on these little guys before purchasing them with the molded plastic Wise boat seats. I read how the clamps are hard to install and hard to turn the wingnuts cause they are placed in a hrad to get to area etc... After using them myself I think people are pretty particular about expecting ULTIMATE PERFECTION from everything they buy. I find it pretty easy to turn the wingnuts and only spent about 4-5 minutes to install the clamp onto my boat bench. I made extra sure to tighten it down really good, and haven't had to adjust it since. It creeks a little and made me nervous at first, but if tighhtened down really good it is super stable and has not fallen off. I have used the clamps with my boat seats about 5 times now and haven't had to adjust mine since the first time I clamped it on. It swivels 360 degrees and does everything I was expecting out of it. It is perfect for me as I have a smaller 14' boat so I can bring myself fishing, or 2 or 3 people and have the versatlity of being able to place the seats in various positions at any time to fit the need of the fishing party.