The GD Grip Ultra 70 is a top of the range, adjustable hand gripper developed for professional athletes and everyone else. The resistance can also be adjusted between 20 and 70kg (44 to 154 pounds). Its care for width is adjustable between 45 to 85mm. These combinations enable the user to make a choice from 17 different resistances. Constructed with a four-link structure that operates in parallel with the handles. This enables natural operation, coinciding with the movement direction of the fingers, with fixed pressure corresponding to every finger. This enables even muscle development for all the hand and from the wrist to the elbow. Adjustable Resistance between 20 and 70kg (44 to 154 pounds). Steel and hard plastic part construction, providing a lasting and powerful adjustable gripper at an reasonably priced price Four Link structure provides muscle development of not only the fingers and the hands but also from the wrist down to the elbow.