The Shackles by Titan Fitness® are the perfect way to add accessories to your X-3 Series Power Rack. Constructed from laser-cut, precision-bent steel that will hold a weight capacity of 500-pounds. This bolt-on set attaches to the upper 3 x 3-inch crossmemeber of your power rack with the included hardware. The shackles, paired with carabiners, allow you to hook into a variety of grip strength accessories including, rings, pull-up blocks, grip cylinders, spheres, and more. Additionally, you can mount the shackles to the front of your upright to add more variety to workouts or utilize them as a space saver to hang accessories.