Tamarack Solar Products, Vee Brace for 60/72 Pole Top mounts.
The V-shaped brace is used to reinforce 60/72 Pole Top mounts for wind load conditions that exceed 100 mph.
NOTE: the picture shows an entire mount assembly. The Vee-Brace described here is the two small, telescoping arms, in a V-shape configuration, at the bottom of the picture. Mount and panels are purchased separately.