Pleated Curtain Cream Square Shaft Cord Tube Spool Left is designed for left-oriented use and is compatible with 5.5 mm square shafts. It fits easily onto grooved upper rails with a 6 mm channel. This cream-colored tube spool works in harmony with the SPY449 chain mechanism. Its right-oriented counterpart is the SPY445 model. The spool ensures cords in pleated curtain systems are neatly gathered and provides ease of use.