A. It is made of soft PVC, which has good compatibility, durability, and a relatively long service life. You can cut and use four different sizes according to your needs. B. Dimensions: 1. Outer diameter of the first part: 25 mm / 0.98 inches; inner diameter: 22 mm / 0.86 inches. 2. Outer diameter of the second part: 30 mm / 1.18 inches; inner diameter: 28 mm / 1.1 inches. 3. Outer diameter of the third part: 34 mm / 1.33 inches; inner diameter: 31 mm / 1.22 inches. 4. Outer diameter of the fourth part: 42 mm / 1.65 inches; inner diameter: 35 mm / 1.37 inches. C. With our vacuum cleaner adapter, you can connect equipment such as grinders and circular saws to workshop vacuum cleaners, industrial vacuum cleaners, and even household vacuum cleaners. D. It is suitable for hose adapters of Henry vacuum cleaners, Kärcher adapters, Festool tool adapters, Makita adapters, Kalamba, Workzone, ParkerSide, Rupes, Anhei, Nilfisk, Bosch, and other brands. E. Whether you are a DIY enthusiast or a professional, this adapter can be a useful item. It can be easily cut to the appropriate size and used as a reducer for suction pipes/vacuum cleaner hoses.