High-Quality Material Made with high-quality Aluminum materials, these replacement knobs and clips are built to last and withstand regular use without wearing down or breaking.General SetThese arm adjustment knobs and clips are designed to fit most rollators on the market, so you can use them as a replacement part without worrying about compatibility issues.Sufficient QuantityYou will receive 4pcs knobs and 4pcs clips, which are Enough to meet your daily needs, a varieties of quantity are provided for you to choose, as shown in pictures.Quality You Can TrustWe are always dedicated to providing the best products and services . If you are not satisfied the knobs and clips for any reason, please get in contact with us, and we will always here to help you, rest assured to buy.Easy to InstallThe replacement arm adjustment knobs is designed in star knobs, easy to install and operate, no extra tool required.