Meet the IronMind Hub: a handy tool that challenges your pinch grip. It comes with a 2-7/8″ diameter. You can start with under 30lbs but in order to be world class, you will need to be shooting for over 80lb.
More gadgets like this ➡️ : here
According to the company, the record for the hub pinch grip is just under 99lb. More info is available here.
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