1. This vacuum cleaner cover is used to suck away the dust or sawdust from the wall or wooden board when the electric drill bit is drilled, to prevent the dust and sawdust from flying and affecting the indoor environment. 2. This vacuum hood needs to be used in conjunction with a vacuum cleaner and cannot work alone. 3. The inner diameter of this vacuum hood is 35mm and can be used directly with most household vacuum cleaners and industrial vacuum cleaners. 4. This vacuum hood is equipped with an additional 35 to 32 adapter to facilitate the application of vacuum cleaners with a diameter of 32mm. Welcome and I wish you a happy life, my friend., Manufacturer: MJFVN