Allied Moulded Products 9338-ESK Fiberglass Reinforced Polyester BMC Fixture Support Ceiling Box 3-1/2 Inch x 2 Inch 14 Cubic-Inch FiberglassBox&trade; Metal ears are securely molded into the box Snap Bracket pushes through opening in wall-board, then snaps out on the back side Nonmetallic Speed "K" Klamps are factory installed