Crimpers
I have an AMP crimper like that, the crimps look like little U channels and the open end goes away from the letters. The crimp forces the free ends toward the dimple and rolls them inboard. We have gel filled and dry crimps. It is also ratcheted and wont open until its all the way home, which sucks because sometimes you get pinched in the palm when you press down in the handle and there is no way to release it. I use a fingerless palm glove on that hand.