I use these from Blue Point. #29CP They will crimp a BIG yellow butt connector until it snaps dead in two. They have really long handles and crimp with little effort. Sorry about the crappy picture. The crimper is at the very back of the jaws. Best thing I ever used and I've used a bungload of them. You kinda have to get the feel for it because on smaller stuff you'll snap it in two, but once you get the feel for it, you will NEVER have a loose crimp again. I prefer to crimp AND solder my connections though.
