These rivets are Internal locking. The internal lock feature insures positive mandrel retention. And does not require a special nose piece.
Mono Bolt / Magna Lock Style Structural Rivets All Aluminum Are 1/4" Diam. With A .625 Grip Range And...
Mono Bolt / Magna Grip Style Structural Rivets All Steel Are 3/16" Diam. With A .250 Grip Range...