936 Features: -Remodeling brace for lighting fixture or ceiling fans.-Adjustable for joist spacing from 16" to 24".-Simple "tool free" expansion of brace.-Preset support brackets.-Positioning claws allow for quick position.-Outlet box can be positioned in any location along its length.-Simple fastener for tightening outlet box and brace.-Nailing spurs allow for easy brace positioning. Includes: -Easy to follow installation instructions included. Construction: -New construction slides apart to accommodate any spacing of joists.-Concrete rings are used with poured deck (floor) in high-rise construction. Dimensions: -Dimensions: 4.03" H x 13.75" W x 2.29" D.