The IronRidge UFO (Universal Fastening Object) is a single-size, single-piece fastener, built to quickly and securely bond any solar modules to XR Rails. It comes fully-lubricated and fully-assembled, and it looks just as good as it performs. When combined with a Stopper Sleeve, the UFO functions as an end clamp. It comes in two finishes: Clear and Black.
 
model numbers
UFO-CL-01-A1 (Mill finish)
UFO-CL-01-B1 (Black finish)