Package - The vacuum filtration apparatus comes with a 1000ml flask, a 300ml graduated funnel with stainless steel, a glass funnel, and an aluminum clamp. It is easy to read the number on the funnel. High Quality ? Made of high quality borosilicate glass, it is strong, durable and heat-resistant. With the aluminum clamp, it provides a secure, firm and sturdy for apparatus. Connect - Glass connect by Clamp. When you put on the graduated funnel, you can clip the glass with a clamp to fix the location. Suitable - The pore size is 30-50?m. It can fit for 47-60mm membrane filter paper. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.