The Marson "Big Daddy" is a versatile rivet gun and the most powerful hand riveter. It is made to set large blind rivets in all materials including structural and split rivets. It features extra-long handles for great working leverage and a double-gear reductiong system so it can set rivets from 1/8"-1/4" in diameter. A one-piece collet eliminates the need to adjust the tool when setting different rivet diameters. Comes with 5/32", 3/16", and 1/4" nosepieces.