Steel, Magnet Parts Tray, Keep Small Parts, Tools, Screws, Nuts, & Bolts Where You Need Them & Readily Available, Heavy Duty, One Piece Tray With Super Strong Magnet That Holds Pieces In Place, Even When Turned On Its Side, Rubber Protective Covering Prevents Magnet From Scratching Delicate Surfaces, Dimensions: 3.75"L x 2.5"W x 1"H.