Those eared clamps were invented by a Swiss company, Oetiker. There are some knock offs that are not nearly as good, like the junk clamps on my Hyundai. Knipex used to make the plier style crimp tools in both end and side crimp, for Oetiker Oetiker now makes their own tools in a new plant in CT. I assume Knipex still makes those tools. Unless it is a very wide clamp, the side crimp model from Oetiker will fully engage from side or end. There are other style boot clamps but the eared ones are pretty common. If you use eared clamps and they are genuine Oetiker and good tooling, they work fine.
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