Save time! Arlington's new heavyduty, one-piece steel box hanger delivers versatility and faster installation than any multi-piece assembly. It's a 2-1/8" deep, 30.0 cubic inch 4x4 fixture box that ships ready to mount, centered on a 24" o.c. suspended ceiling grid. If you need the box off-center, you can position it anywhere along the bracket. For an even bigger box, the versatile FS427SCL comes with two extension brackets to use if attaching a standard 1-1/2" deep extension ring (not supplied). They keep the extension ring flush with the ceiling. Listed to hold a fixture up to 50 lbs, FS427SCL meets the new UL requirements. One-piece assembly - box hanger ships ready to install Fully adjustable box position If required by local code, bracket ends screw to grid