Pleat hooks with U-runners are available and suitable for U-rails. The closable hooks smoothly roll on the rail without entangling itself and allow for even pleat creation. As a result, opening and closing the curtain is very easy and the pleat formation is always accurate. The plastic hooks are washable up to 30 degrees. 10 U-runners with pleat hooks are available on a card in Prym's assortment.