Hand Gripper Strengthener With Hard Plastic Handle To Increase Hand Wrist Finger Forearm Strength With Hand Grips Best For Musicians Athletes And Hand Rehabilitation Exercising What Is The Hand Grip Strengthener With Hard Handle? The Hand Grip Strengtheners Can Be Used To Strengthen The Muscles In The Hands, Arms And Wrists. They Can Also Help To Enhance Your Performance When Taking Part In Sports Such As Mountain Climbing, Gymnastics, Motocross, Horse Riding And Weight Lifting.