The difference between size 0, which measures approximately 0.33mm across, and the largest size 15, which measures approximately 0.62mm, is only 0.29mm.
That makes the difference between the sizes approximately 0.02mm. (We say approximately because they are so difficult to measure.) Millgrain tools are marked with a size number from 00 through 15 to help with identification.
Cup-shaped cutters on wheels used to dress up a setting, ring mounting, or any piece of jewelry, by forming a decorative bead or fine row of cuts along the edge.
Size: number 1
Size: 0.35 mm