This product contains 1 set of 10 tube brushes with varying diameters. The diameters for these 10 brushes are 2, 3, 4, 5, 6, 8, 12, 16, 20, and 24 mm (1/16, 1/9, 1/6, 1/5, 1/4, 1/3, 1/2, 2/3, 3/4, and 1 in). All brushes are 8 inches long, dishwasher safe, and constructed with stainless steel and nylon bristles. Each set of 10 brushes comes with a detachable key ring for quick and easy access. All brushes have a convenient loop at the end of the handle to hang when not in use or to reattach to the key ring for safe keeping. Common Uses… Airbrushes Bottles Carburetor Passages Cell Phones Colanders Dishes Drinking Straws Drip Tips Espresso Machines Eye Glasses Glass Droppers and Dropper Bottles Guns Hummingbird Feeders Jewelry Keyboards Paint Spray Guns Pipes Pressure Cookers Sewing Machines Sippy Cups Small Nozzles Tattoo Equipment Thermal Coffee Tops Tubes Vaporizers Water Pumps