SQ-F24-Base (8.5'' baseplate)The SQ F24 Base is the standard aluminum plate for the 8. 5'' box truss. It measures 8. 5'' x 8. 5'' so it fits within the foot print of the truss. It is very simple to mount, just slide the truss tubes over the half couplers on the plate and insert the pin to secure. No nuts or bolts to mess with! Features: Fits 8. 5'' square aluminum truss 1 1 3'' main tube 1 3'' brace tube Connecting hardware included Please give us a call at 1 800 793 5308 and