Suffered from different sizes of funnel and flask caps? You need our adapters. Our Buchner funnel adapter set can be fit for different diameters. You can use a single one or nest adjacent sizes together to fulfill your task. Also it helps reduce the risks from insertion and removal of glass stems via these rubber cones. Features - Color: White. - Material: Rubber. - Size: About 8.50X8.50X4.00cm/3.34X3.34X1.57inch. - It is made of rubber material, is flexible and can be used for a long term. - This funnel adapter set great for Buchner funnel or a Buchner flask for filtration. - Nine different diameters, suitable for different sizes of experimental apparatus. - Can reduce the risks associated with insertion and removal of glass stems through these rubber stoppers. - It has reasonable design, simple operation method, and saves time and effort. Package list: 1 Set x Buchner Funnel Flask Adapter Set