Metal tape measure 

Decide if you want the blind to fit "inside" or "outside" the window. Scan the window and check that no handles or objects will interfere with the operation of the blind. Generally blinds are fitted inside the recess, unless there is not enough room. The depth required within the frame for rollers is a minimum of 60mm

Decide if you want the fabric to roll over the front of the tube or over the back (most common is over the back)

For inside fit measure width first then drop (height). Measurements must be exact so take measurement in three places for the width (top, middle and bottom) and where there is a difference use the smallest measurement. Use two measurements for the height (one at each end) and where there is a difference use the smallest measurement

For outside fit measure from the outside edge of the frame on the left to the outside frame on the right. The size you provide us will be the widest part of the blind 

Choose your chain control side. Usually the most convenient side to get to

Chain colour

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Beige/Black/Grey/White/Nickle Plated

Control unit colour

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Beige/Black/Grey/White