★ Hand Gripper: Made of 304 Stainless Steel, Ball bearings on both sides reduce friction when closing while providing the necessary stability of the upper handle to avoid imbalance, and the pulling force on your fingers will be evenly distributed ★ Adjustable Strength: This gripper is designed with 5 stainless steel springs (3 30kg; 2 15kg), and users can adjust different strengths according to their needs, suitable for users of various strength levels for daily exercise ★ Non-slip handle: the handle with knurling design, is detachable, and the grip distance is adjustable in five levels between 4mm and 30mm, meet the needs of different age groups, from teenagers, adults, men, women and the elderly. ★ 304 Stainless Steel: The overall 304 stainless steel structure, selected materials are sturdy and durable, and the ergonomic knurled handle fits the palm of the hand and is non-slip. ★ Multiple Applications: This is a hand grip exercise device, which is an essential tool for rock climbing, wrestling, horizontal bar/parallel bar, rings, tennis, gymnastics and other sports people to test and analyze grip strength.