1. [VERSATILITY]: This dryer vent cleaner kit comes with eight (8) flexible rods. Our dryer duct cleaning kit is 4' diameter, and can be used in ducts from 3 - 4'. These can also be used with a/c ducts and pellet stove pipes. They work great with PVC, flex ducts, metal ducts, pipes, and deliver results fast 2. [USE IN TIGHT SPACES]: The rods provided in our kit are extremely durable, flexible and will bend with little to no effort at all. To use with tight angles, attach the un - threaded part of the extension rods directly to a drill just like you would a regular drill bit. Keep the brush spinning at a low speed and use steady, easy pressure to help work the brush around the bends in the vent 3. [EASY TO USE]: Our dryer duct cleaning kits can be used inside of your home or from your outside vents. Simply disconnect the pipe from the dryer and from the wall (connection is usually located right behind the dryer); The kit can be used connected to a drill. Always use the drill in a clockwise direction to prevent the rods from unscrewing at the threaded connections. Add extension rods as needed and secure them with duct tape. It is durable and effective 4. [SAFETY AND EFFICIENCY]: With over thousands of dryer fires occurring each year, help protect your family and home by using our dryer duct cleaning kit. With our cleaning kit, you can easily remove dangerous lint build - up. In addition to helping to prevent dryer fires, this will also reduce drying time and help extend the life of your dryer