The 303 gaming chair armrest has a 1D 3-hole design with up and down adjustable functions, providing a comfortable experience and support. The 1D design of the armrest can be adjusted in a single direction, making it easy to adjust the height according to personal needs. The 3-hole structure makes the armrest more stable, ensuring that it is not easy to loosen during use, improving the overall durability and stability. Users can replace the armrests of different styles or materials as needed to improve personalization and comfort.