The SQ-F24-Base measures 8.5" x 8.5" and is the standard aluminum plate for the 8.5'' box truss. It mounts easily with no nuts or bolts - just slide the truss tubes over the half couplers on the plate and insert the pin to secure the baseplate in place.
Fits 8.5'' square aluminum truss
1-1/3'' main tube
1/3'' brace tube
Connecting hardware included