This is an update on the KST-03. I have used the hand pliers for several days and not one snap of any size has broken. I used the same snaps that kept breaking on my other set of pliers. I'm not sure why these function so well as the body of the pliers look identical to the set I previously used. The only difference is in the screw in dies on the KST-03. Not sure why but thrilled with them!