ALERA-SUPPORT,48" SR 2/PACK. Wire Shelving Back Support, 48" Wide, Silver, 2 Supports/Pack. No need to damage your walls...simply add a wall saver back support unit to prevent items falling from behind or damaging your walls. Stock and restock quickly and confidently with this sturdy solution. Color(s): Silver; Material(s): Steel; For Use With: Alera® Wire Shelving Units; Size: 48" Wide.