Adjustable Hand Grips Where you can Now Adjust The Strength Tension from 5kg - 20kg. An Excellent Training Tool That Strenghtens the hands, Wrist & Forearm. If you don't have sufficient power in your hands then thid clever little machine will really help. You will be suprised how quickly weak helps your forearms. Its great also for sports enthusiasts where having a stronger grip / fingers is important.