Product Info: Perfect Fit Roller Blinds are one of the best & easiest solutions for rectangular UPVC windows & conservatory windows as they require no drilling to fix! They attach onto the window via metal brackets which slip in between the glass & beading of your window allowing the blind to simply clip into place. The blind is held under constant tension allowing you to raise & lower the blind to your desired position via a central handle & thanks to the tension the blind stays in the position. Each of our fabrics in this range consist of a three pass blackout fabric made from 100% polyester on the front side, blackout layer sandwiched in between & a matching coloured acrylic backing. As well as providing amazing blackout qualities this fabric also offers fantastic thermal insulation.