I saw those from Murrays but since they are stainless you still have stainless in direct contact with the aluminum. Granted you get the water tight seal but you get those with the closed rivets as well, and it they are less hassle than the two pieces and having to drill the holes out bigger. Cost is close to the same though. I have heard the monel over stainless arguement and while I can see the advantage in a large boat where the rig stays up all the time I have never had a corrosion problem on my beachcats, probably because the mast gets washed after use.