Soap dispenser holder dimensions: 7 x 5 x 6 cm. Inner diameter of the large opening: approx. 3.3 cm, inner diameter of the small opening: approx. 2.7 cm. Note: For all glass bottles, the opening diameter is less than 2.7 cm and the bottle cap is more than 2.7 cm. If the bottle cap measures more than 3.3 cm, you will need a 2.7 cm soap dispenser. The pump bottle diameter is less than 3.3 cm. If the pump cap measures more than 3.3 cm, you will need a 3.3 cm soap dispenser.