The purpose of the Monster Gripper is to condition the hand/gripping muscles to a force above and beyond what it is used to. This is the reason behind the long handle, so that it can be put into a door frame, or a power rack and then cheated shut using gravity and the body weight of the trainer.

You could also say that the Monster Gripper is as much of a “Mental” strength developer as physical — the #4 spring sure doesn’t look so tough after playing around with it.