This high-quality zinc polishing disc has an outer diameter of 6 inches, an inner diameter of 12.7mm, anThickness of 10 mm is double-sided flat and thick. Made of high-quality zinc plates, it is sturdy and durable, and can provide a smooth polishing surface for jewelry gemstones. It is suitable for polishing gemstones with not particularly high hardness, such as crystals, garnets, tourmalines, sapphires, rubies, agates, turquoise, etc. The 6-inch diameter is moderately sized, easy to operate, and can meet the polishing needs of most jewelry. It works in conjunction with diamond grinding paste to achieve fast and uniform polishing effect, and the flat design can also ensure that the jewelry maintains a stable level of flatness during the polishing process.