J & J Fitness Doorway Gym Can be used with popular DVD workout programs Adjusts to fit most doorways with sturdy frames 24 to 36 inches wide Multiple grip positions allow you to work muscles from different angles (i.e., closed-wide angle grip, closed-wide hammer grip) Heavy duty construction with comfort in mind with Comfort Grip technology. No costly mounting. This chin up bar slips on and off door frame easily for fast storage portability!!