https://www.kellyhayes.com/slr200sa-kit-unistrut-solar-end-clamp-for-strut-based-racking-system-includes-high-wind-clamp.html
https://cdn.shopify.com/s/files/1/0614/5546/6701/files/PVKit2-Brochure-05212018.pdf?v=1686620738
it's apparently either for high wind load (not sure if a flat mounted...