Application- Liquor Bottles sizes many Half Gallon and 1.75 Liter and other Large bottle openings Material- Plastic with Poly fitting Cork Diameter 27mm (bottle opening to poly cork), measured ball bearings Measured Pour 1.5 oz. 1.5 oz. chamber size for one and half ounce pours, just pour at a 45 degree angle to release liquid from chamber at the same time filling the next measured 1.5 oz shot.