Granite Fitness Hercules 1.9 Rolling Spinning Grip & CarabinerThe Rolling Grip length is 5.5 and this particular sale is for the 1.9 grip diameter.Granite Fitness Hercules Spinning Grip is 100% made in USA, no excuses. We made this simple rolling grip in collaboration with a few strength and powerlifting athletes. We all know that the Spinning Grip is a fun tool to test maximum grip strength, it can be used both for training and competition.Granite Fitness Hercules Rolling Grip can be used for grip training, useful for climber, arm