Grippers

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Grippers, sometimes called hand grippers, are primarily used for testing and increasing the strength of the hands; this specific form of grip strength has been called crushing grip,^[1] which has been defined as meaning the prime movers are the four fingers, rather than the thumb.^[2]

There are differences from brand to brand, but the common feature of standard grippers is that they use a torsion spring fitted with two handles. The exact dimensions of these elements vary, as well as the materials used to make them; the springs are made from various types of steel, and the handles are generally made from wood, plastic, steel, or aluminum.