Toweter Mattress Grippers,Sheet Mattress Corner Straps,Fastener/Holder/Strap For Your Sheets(White) Adjustable length is 21cm-40cm. 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. Great For Bed Sheets and Mattress Covers . Strong suspender clips . Keeps bottom sheets on all mattresses, even hospital beds, hide-a-beds, adjustable beds, inclining beds, baby's cribs .