21.5 cu. in. suspended ceiling fan brace with a 2-1/8 in. box allows you to safely install your ceiling fan or lighting fixture. Ideal for installation during new construction or remodeling, this mounting brace can be put into suspended ceilings through a 4 in. hole. This brace works with all ceiling fans, so you do not have to worry about size or compatibility. The brace's multiple locking bracket easily inserts and locks into the suspended ceiling grid. The Suspended Ceiling Fan Brace and box comes with everything you need for installation, including easy to follow instructions. UL listed to support lighting fixtures and fans 70 lbs.. or less.