This is a fitting that allows you to convert your existing curtain rail to a return style. It allows you to cover the gap between the wall and the rail with the curtain. Improved insulation performance. Also contributes to energy saving. For cold and heat protection. Reduces light leakage from the sides of the rail. Improved light遮光性. The product is made by Toso, but it can be installed on other manufacturers' rails if the rail end is screw-fixed. Set of 6. Cap-integrated return fitting N Toso Legato Nexte Elite Light遮光性 Cold protection Insulation Soundproofing Blackout curtains Insulated curtains Soundproof curtains Tachikawa Toso Curtain rail Nitori Mujirushi (MUJI) Toli Sangetsu Color: Silver Season: All Season