Westinghouse 48 inch T8 Linear Fluorescent Tube Guard with End Caps 0794600 Tube Guards are clear polycarbonate safety sleeves that slip easily over the light bulb. In the event of breakage, these lightweight sleeves contain the shattered glass fragments and phosphors and prevent possible injuries. These guards come in a 48 inch or 96 inch lengths and are available for either T8 or T12 bulbs. In commercial applications, linear fluorescent tube guards are ideal for safety use in food processing areas, restaurants, printing plants, stores, offices, warehousing areas and factories.