The long handle is designed in such a way that the force can be adjusted depending on the position of the handle. The longer the distance between the handles, the weaker the force. Conversely, the shorter the distance between the handles, the greater the force; M specification applies to tension in the range 30KG-55KG The handle is made of rubber and has a non-slip textured design. The surface of Power Twister is made of double-plated spring steel, which does not easily peel off the paint with long-term use. Thick steel tube wall, not easy to deform and bend, not broken or damaged, strong fatigue resistance After tens of thousands of bending tests, Power Twister is more than a step harder than other brands. So beginners are recommended to choose 20-40kg; fitness enthusiasts can usually choose 30-55kg. Fitness professionals with long fitness experience and good physical condition can choose 45-80kg The Power Twister bar is an indispensable device for fitness. It is ideal for developing strength in the upper limbs of the body. The squat dumbbell can be used for shoulder, arm and chest exercise, upper body training, forearm muscle training If you purchased product from our store . You benefit from high-quality after-sales service! If there is a problem with the product you purchased, please do not rush to refuse our product. Please contact us as soon as possible, we will solve the problem for you immediately.