Pleated Curtain Cream Square Shaft Chain Mechanism Short is compatible with 5.5 mm square shafts and features a short-arm design, making it ideal for compact curtain systems. It is used with grooved upper rails with a 6 mm channel. The cream color ensures compatibility with your curtain system. Fully compatible with SPY445 cream cord spools, this chain control mechanism allows easy opening and closing of the curtain and offers a very practical installation.