If you had to pick just one grip strength tool, this is it: Captains of Crush grippers are the gold standard for building and testing grip strength, and they are the fastest route to the strongest grip. Features include premium materials, proprietary components, precision manufacturing and unrivaled customer support. Available in 11 strengths for a perfect fit, whether you are just starting off, rehabilitating an injury, or can already crack coconuts with your bare hands. Made in the USA by industry leader IronMind, nothing else puts power in the palm of your hand like a Captains of Crush gripper.