The Utility Hook is the smallest—but mightiest—gym storage solution. This solid steel s-hook quickly slides into tubing holes up to 11 gauge (2.9mm thick). Organize your cable attachments along the centre upright of your All-in-One Trainer . Hang lifting chains off the sides of the rear upright on your Cable Tower . Store your barbell across two hooks on a 76" wide Hydra Universal Storage System. And this is just the beginning. Beyond your gym's space restrictions, the only limit is your creativity. Don't be surprised if you get hooked . IMPORTANT: Fits all round holes on tubing up to 11-gauge (2.9mm) thick and is cross works with other brands as long as the gauges isn't lower than 11.