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The Harbinger Adjustable Grip is the most effective way to strengthen your hand grip and tone your arm muscles. The forearm is an often neglected but awe inspiring muscle. When it´s big and toned it can make any physique look that much better. The Adjustable Grip is built for high repetition endurance training. It includes 3 weight increments of 30, 40, 50 lbs of resistance. Three rubber interchangeable weight resistance caps - for total training flexibility. It is constructed of molded thermoplastic handles and aerospace cushioning inserts molded into handles for added comfort.