Are you worried about the dangerous batt accumulation in your dryer vents? Is your clothes drying in the dryer for a longer period of time? This practical and effective dryer duct cleaning tool kit will help you reduce drying time and improve dryer performance. And it also can be used in chimney, boiler and so on. Features: The brush wire is made of nylon, which is resistant to high temperature and aging, not easy to corrode. The brush rod adopts a soft connecting rod, which is flexible and convenient to clean and has a long service life. High flexibility, perfect to get through the flue bends. Single pin thread push fitting, no looseness in any direction of rotation. This efficient dryer vent brush can be used with or without a power drill and will help you achieve professional results. It is a necessary helper for cleaning the chimney and dryer vents, extending the life of the dryer and chimney. Specifications: Material: nylon Color: black+white Type: 1-3 (optional) Single connecting rod length: 600mm / 23.6in Connecting rod diameter: 8mm / 0.3in Package size: 360 * 250 * 60mm / 14.2 * 9.8 * 2.4in Package weight: Type 1: 236.2g / 8.3ounce Type 2: 432g / 1.0lb Type 3: 601g / 1.3lb Package list: (optional) 1 * Brush Unit 4 * Rod OR 1 * Brush Unit 6 * Rod OR 1 * Brush Unit 12 * Rod