Those galvanized steel premounting plates allows for mounting ThinLED and Retina fixtures in a new construction application.
The plates include mounting holes and tracks to satisfy any type of installation. Alignment notches on the plate help aligning multiple plates for consistent spacing.
TL4020U Specification Sheet
Installation instructions - (TL4020U)
Installation instructions - round (TL4020)
Installation instructions - square (TL4020S)