What does grit size determine in sandpaper?

Grit size plays a crucial role in determining the coarseness of sandpaper. It refers to the size of the abrasive particles embedded in the paper. A lower grit number indicates larger, coarser particles, which are effective for removing material quickly and smoothing rough surfaces. Conversely, a higher grit number signifies smaller particles, resulting in finer, smoother finishes. Therefore, grit size directly influences the sandpaper's ability to shape, smooth, or finish various materials, making it essential for selecting the right type of sandpaper for a specific task.