The RollEase R-Series Clutch R8C03 for 1-1/4 Inch Tube is for operating RollEase R-Series R8 roller shade systems. Moreover, the clutch gear mechanism operates using a bead chain (not included) or cord loop (not included). Furthermore, the clutch face measures 2 inches wide by 2-3/8 inches tall and fits into 1-1/4 Inch outside diameter RollEase tube.