Package contents: you will receive 4 pieces cord pulleys that work well for roman, pleated and Australian shades; Enough quantity for meeting your replacementEasy installation: the cord lock can be installed easily and quickly, without too many complicated tools, even for people who use it for the first timeSturdy and reliable: the cord pulley is made of iron and plastic, which is durable, not easy to break or deform and can serve you for a long timeWork well: if you want your shade to operate smoothly, please choose to use pulleys instead of screw holes; there is a small wheel in the pulley and it will rotate through the screw when the cord rolls on top of it versus being draggedWarm tips: these cord pulleys can be applied with any lift cords, but please confirm the size before purchasing