Make sure this fits by entering your model number. 【Adjustable Power Twister】:You can choose different resistance strength that suits you by rotating the knob left or right.One button adjustment intensity.Easily adjust 1-25 level resistance,Gradually increase resistance and strengthen their own strength training to achieve muscle strengthening. Arm exercise equipment can help reduce arm fat, abdominal fat, and increase the gathering effect of the chest. Perfect for reducing fat and weight and increase strength training. 【Exercise method】:Three-function LCD display-monitor your time, times and calories,Muscle training (men) to increase resistance (15-25 gears), (women) to increase resistance (5-15 gears) at normal speed (complete a round in 2 seconds), 20-30 each time, 3 times as a group, half an hour Do 3-6 groups inside. Unisex weight loss method:Reduce the resistance (1-9 gear), about 2 rounds per second,60-200 times according to each person's physical strength, themore times, the more calories 【Safe Fitness】:Research shows it is very dangerous to use spring power twister,because its springback is violent,easy to hurt you;the spring in the middle will easily pinch youself;the spring is prone to break after prolonged use.Please throw away those spring power twister,try our hydraulic power twister which is safer and more durable becasue of the patented hydraulic adjustment system principle.There is no danger of the spring breaking,won’t rebound and hurt yourself! 【Golden Ratio Triangle Structure】:The unique golden ratio triangle structure,maks the arm trainer more load-bearing capacity,always keep it in a stable state,ensure the safety for using.So whether you are a novice or a veteran,it will be very suitable for you.Perfect for exercising your wrists,arms,shoulders,chest and back at the same time,developing your grip,building strength on your fingers,wrists,and increasing the muscle strength of the upper body 【Best gift for exercisers】 Whether you are a professional or an amateur, novice or veteran, for all ages, men and women, young and old, bodybuilders or fitness exercisers, health and fitness are the most important, this hydraulic Arm machines are always the ideal strength training choice. With this single exercise tool, you can enjoy professional strength training at home with your family. KALAWW Workout Equipment Twister Arm Exerciser Adjustable Hydraulic 22-440lbs P