Square Truss Corner 2 Way 90 Degree Round

The ProX   XT-SQ164-2W90-RC 2-way 90° Rounded Corner,  1. 64 ft. (0. 5 meters),  truss corner helps you easily make soft squares or rectangles and works with the ProX XT Series box truss.

ProX Truss has the most trusted staging support systems in the industry, and is built to the highest standards of safety and performance...
https://www.proxdirect.com/products/view/1029