The AX-48 Pro Threaded Adapter from Ultimate Support fits into the accessory space at the top of your APEX AX-48 Pro Keyboard Stand. Easy to install, simply snap the AX-48 Pro Threaded Adapter into place and tighten the 2 included bolts. Once you install the Threaded Adapter, your APEX AX-48 Pro Keyboard Stand will have a 5/8" thread on top for mounting a microphone boom arm or any number of other devices. It's a great solution to your HyperPad, HyperStation QR, or HyperMount QR stand for mounting iPads or laptops to the top of your AX-48 Pro Keyboard Stand.