In 1991, IronMind added luster to the world-class feats of grip strength by certifying people on the fearsome No. 3 Captains of Crush Gripper, and since then weʼve included the No. 3.5 and the No. 4 CoCs, as well as the Red Nail. Hereʼs how you certify on the Captains of Crush Grippers and hereʼs how you certify on the IronMind Red Nail . These lists—No…

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