Measured Bottle Pourer: As the name suggests, it pours an exact 30 milliliter measurement of alcohol directly into your glass, making it ideal for parties and events. Quality Materials: The automatic measuring liquor pourers are made of virgin plastic, a durable material that will not corrode and can be safely used over long periods. Easy to Use: Simply insert the pour spout into the neck of the bottle and pour at a certain angle. Fits most bottles and functions as both a pour spout and stopper. Compatible with liquor bottles with a diameter of 20 to 22 mm. Can also be used with juice, syrups, and oils. Note: Inaccurate pouring may occur when used with water. Reduces Waste: The ball bearing mechanism dispenses 30 ml per pour, helping to minimize over-pouring and reduce waste, allowing for additional servings per bottle.