Double roller blinds are a classic design with a completely new function: By individually regulating the light as with a Venetian blind, the double roller blind has an opaque, semi-transparent, or transparent function. It allows daylight to pass through and, at the same time, provides you with adequate privacy. The fabric, woven alternately into transparent and opaque segments, runs in two webs one above the other. It is very easy to install by means of the clamping supports on the window sash. The clamping carrier is adjustable for window sashes. A chain tensioner is included for fixing the roll-up blind chain in place. The chain tensioner serves to fix the roller blind chain in place. The chain runs taut to the window sash, which reduces the risk of injury to children. If the chain hangs freely, children can get caught in the loop and get injured. Please only use solid measuring tapes, such as a folding ruler to get the right dimensions. To determine the width required, measure from the centre of the frame on the left to the centre of the frame on the right. Please note that the fabric panel can run past the window handle. The ordered width minus 4cm corresponds to the fabric width. Manufacturer's note: The colour rendering of the above picture or materials shown in the image may differ slightly from the actual item.