Strong triangular design for triple protection and to ensure a more durable fixation. Works with almost all types of bedding. Pack of 4pcs fitted sheet stretchers, original length is 9.5cm to 16cm, stretchable up to 25cm to 45cm, adjustable length allows for desired tension. Designed to hold the cover securely in place, ensuring a smooth, wrinkle-free surface for much better results. Suitable for bed sheets, ironing board covers, seat covers, sofa covers, mattresses, blankets, quilts, tablecloths, etc. Sheet or ironing cover taut thanks to these 4 stretchers! Equipped with plastic-coated metal clips, they keep the ironing sheet or cover securely in place.