Bed Sheet Fasteners WITH METAL ADJUSTERS Mattress Cover Holders Grippers Suspenders Straps Clips | Perfect Fitted Bed Sheet Fastening System - Black, 2-Pack (8 pcs) Make your life easier. Hold sheets tight all night long. Use Cover Fasteners and never worry about messy or wrinkled sheets again. Great For Bed Sheets and Mattress Covers. Built-in plastic clenching system protects fabric from harm. The newest and hottest product being used for keeping sheets tight all night long! They are easy to use and keep your bed looking great at all times. Wide elastic bands provide stronger tension Adjustable length allows desired tension. Keeps corners in place and no more worries. Lift mattress and fasten one clip to edge of sheet . Repeat above for all 4 corners. Perfect Fitted Bed Sheet and mattress Cover Fastening System!