Material: These vacuum adapters are made of high quality PVC material, which is durable and easy to use, which is ideal for most vacuum cleaner hoses. Suitable for most diameters: These adapters are suitable for most vacuum hoses as most diameters are 32mm or 35mm. You can also cut the vacuum adapter into the required diameter from 21mm to 35mm. Applicable to various brands: The vacuum cleaner hose adapter is applicable to manufacturers of various brands, such as Bosch, Aigen, Parkend, Krcher, Maki, Meetab, Worx, Domen Ze, AEG, Nilfisk, Mulmaster, Festo, Bosch, etc. Wide application: It is ideal for dust removal tools such as curve saws, circular saws, belt sanders, arbitrary rail sanders, table saws, orbital sanding machines, cut-off saws. Package includes: 3 PCS dust collectors. Can be used straight or cut as needed to use a saw or cutting machine.