That is what a friend calls a "squasher", better is the staking type, best is full compression:
Here is another sort, for non-insulated terminals:
I use it when the insulation would be in the way...
Much better, but you need a better "full compression" crimping tool--like this from HF. It lets you crimp both the metal terminal to the bare wire and the plastic insulation to the wire;s insulation forming a strain relief.
Like this: