Stop loosing sleep over flimsy wood bed slats that creak every time you move! These super-strong steel supports hook over the bed rail to hold your mattress and box springs securely in place. Quick and easy to use. Can be used with wood or steel frames. Each set includes six foam pads to prevent scratches. Six-Piece Steel Set, 4"L x 2"W x 1 1/2"H; Six-Piece Wood Set, 6"L x 2"W x 4 1/2"H.