If you've got to crack a heavily torqued nut, best to use a six sider, if you have enough access and "swing" room available, but sometimes the extra angles available with the pastry-cutter type will allow you to get on the nut, and have room to crack it. If it's a good fit, it shouldn't have a problem. Obviously, you shouldn't use a rachet to crack a heavily torqued nut.
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