SANG Diamond grinding cup wheels are categorized based on factors such as the type of bond used, the diamond concentration, and the wheel shape. Each category has specific characteristics that determine its application. For example, metal-bonded wheels are suitable for hard materials due to their durability, while resin-bonded wheels are more flexible for grinding softer materials. The diamond concentration affects the cutting efficiency and wear resistance, with higher concentrations providing longer life but potentially slower cutting. The shape and size of the wheel also influence its grinding capacity and precision, making it essential to choose the right category for specific tasks.