Bonsai Bar Strainer Product DimensionsØ10cm Length 15cm It is a special bar strainer used to strain cocktails prepared in mixing glasses and two-piece shakers into the glass. It is a strainer consisting of a flat, round and perforated metal section and a spiral attached around it. In order to strain the prepared cocktail into the glass, this strainer is placed on the mouth of the shaker and the mixture is poured into the glass. Ice and other substances in the mixture are filtered.