The Marsom HP-2 does a good job on SS 3/8 rivets, but it takes two hands.

A word of caution on the Marsom, the nut that holds the spring in the top of the gun can come loose and it can shoot out. I had this part whiz by my ear like a bullet while riveting a SS rivet, keep your head clear and wear eye protection.

I replaced the Marsom with a Stanley from Home Depot, I dont have the model #, but it was $19 and yellow with a swivel head. It doesnt grab the rivet when you go to take the second squeeze and the middle of the rivet drops into your boat. Not recommended.

Bill