Metal Your purchase includes One Set of brackets to attach heardboard to LUCID L100 Adjustable Bed Steel Frame and Hardware. Wrench (recommended) not included Bracket dimensions: 15.25" W x 3.5" Dx 10.25" H Used to exclusively attach the L100 adjustable bed base to your headboard; brackets are compatible with all LUCID headboards Easily customize the width, height, and distance from wall for universal fit Made of solid steel for excellent durability and security