The RollEase R-Series Clutch R16C53 for 1-1/2 Inch outside diameter tube is for operating RollEase R-Series R16 roller shade systems. Moreover, the clutch gear mechanism operates using a #10 bead chain loop (not included). Furthermore, the clutch face measures 2-11/16 inches wide by 3-1/4 inches tall and fits into 1-1/2 Inch OD RollEase Tube. White is R16C53W, Vanilla is R16C53V, Black is R16C53BK.