There are 10 part numbers on their file for this. Not sure which one this item equates to. Not sure I can find this on their website

Steel Single Deflection Return Grille with ¾” blade spacing, 35° fixed deflection, Blades parallel to the long dimension

Effective air balancing begins with the balancing provisions that are designed into the HVAC system. Titus balancing devices are easy to select and specify. They are designed for quick access and adjustment and are engineered for the least possible noise, turbulence and air resistance. Titus makes available published flow factors for all Titus diffusers. This allows precision balancing to be performed in the field with accuracy based on prior test results. FEATURES AND BENEFITS AG-15 models are neck mounted opposed blade damper for use on Titus 300/350 grilles and registers Gang operated opposed blades meter air volume with minimal disturbance Mounts using spring steel S-clips Steel and 304 stainless steel models are slot operated