【High Quality】- These tube brushes are nylon bristles and stainless steel lever, with good elasticity, lint-free, rust-proof, environmentally friendly and durable. 【12 Different Specifications】- Length: 21cm, 9 nylon brushes different diameters: 2, 3, 4, 5, 6, 8, 12, 16 and 20 mm (1/16, 1/9, 1/6, 1/5, 1/4, 1/3, 1/2, 2/3 and 3/4 in), and 3 separate brushes: 1.5, 10, 18mm (3/5, 2/5, 7/10). 【Easy to 【Install and Use】- Tube brushes can be quickly disassembled or installed with the key ring, there is a capillary protection of the dispensing tip against scratches on your instrument. 【Set by a key ring】- All brushes have a convenient loop on the handle for hanging when not in use, not easy to lose. 【Application】- The lever of the tube brush is flexible, can clean the corners, can effectively remove stubborn dirt, soft handle, easy to use, and it will not hurt the inside of the instrument to remove any dirt. Suitable for milk bottles, the spout of the pot keyboard, test tubes, glass bottle