BenQ RM8602K 86" Class 4K UHD Educational Touchscreen LED Display - Manual (Page 59)

59 Mounting installation
Step 5: Installing both Bracket L and Bracket corner on the frame at four corners
1. Installing Bracket L
2. Installing Bracket corner
3. Repeating the same actions at four corners
Step 6: Assemble Pipe TOP and Pipe BOT
1. Assemble Pipe TOP and Pipe BOT
2. Fix 4 Cover plates