Toweter 4 Pieces A Set ,3-Way Bed Sheet Fasteners Grippers Suspenders,Sheet Mattress Corner Straps(Black) A set of 4 straps, one used diagonally for each corner of the bed. Metal Clasps For Secure Grip,keep all sheets smooth and tight on any bed. High elastic quality, hold sheets tightly. The bedding holder clip are fitted for any bed sheet both king size and queen size mattress gripper. Keeps bottom sheets on all mattresses, even hospital beds, hide-a-beds, adjustable beds, inclining beds, baby's cribs .