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20KG Arm Rod Spring Steel Exerciser Power Wrist Hand Gripper, Strengths Arm Rod Fitness Equipment Chest Expansion Device Features: The role of throwing arm device, Methods is also known as grip strength. It is used to exercise the arm muscles.Its main exercise muscles and chest auxiliary exercise wrist. Increase the muscle strength of upper limbs.including the pectoralis major shoulder elbow and wrist joints and other parts of the power. It can make the upper limb muscles and increase the arm strength.Improve the quality of the body. Perfect for building upper body strength.The is a portable exercise device that is great for home, office or travel use.