Four-gear Power Adjustable Multifunction Arm Strength Training Device 1. Material: TPR handle + spring steel 2. Total length: 50 cm 3. Weight: 2.05kg 4. Adjust the rotation nut to adjust the strength, the four-step strength can be adjusted, you can adjust according to your training progress 5. When you use it for fitness, you can move closer to the middle of the two handles, and evenly apply force to avoid the sound of the spring opening or closing 6. The arm strength device is used to exercise arm muscles, mainly to exercise arm strength and pectoral muscles, and to assist wrist exercise 7. Increase the muscle strength of the upper limbs, including the pectoralis major muscles, shoulders, elbows, wrists, etc., can make the upper limb muscles develop and increase arm strength. Improve physical fitness 8. The non-slip and wear-resistant handle will not cause a beater or a face when you can't control it with a straight arm stick 9. Ten high-strength springs, uniform force distribution, reliable and durable