Description: - Portable folding fan-shaped gem size and diameter measuring tool, made of aluminum material, light quality, easy to store. - You can choose from many styles: 6 arms fan-shaped, 8 arms fan-shaped, and 6pcs round shape . - Suitable for measuring the diameter of diamond, gem and agate beads. - With professional size scale on the surface, it is a very practical tool for jewelers and jewelers. - With the help of this sizing gauge ,you a to calculate the size and weight of a diamond.Specification: - Material : aluminumSize Chart:6 arms fan gauge hole -6mm ,length 55mm8 arms fan gauge hole -10mm.length 55mmround fan shape :square size hole size 2-4mmround hole size approx 1-10mmPackage Includes:1 set diamond fan gaugeNote:Please allow slight measurement errors and color difference,thanks for your understanding !