What grit number is commonly used to produce a high gloss shine on nails?

The selection of 240 grits is appropriate for achieving a high gloss shine on nails because this grit level strikes a balance between smoothing the nail surface and preparing it for polishing without causing damage. A 240-grit file is fine enough to refine the nail while maintaining the integrity of the nail bed. It effectively minimizes imperfections, allowing for a smooth finish that enhances shine.

On the other hand, while lower grit numbers like 180 are used for shaping and effectively removing more material, they can lead to a rougher surface if not followed with finer grits. Grits like 320 and 500, although finer, may be too soft to achieve the necessary smoothness required before polishing, which could result in less shine. Thus, 240 grit serves as the ideal transitional step to ensure nails are adequately polished to a high gloss.