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The reason why car beads have car marks.
Causes and treatment of water milling.

1, water mill reason: the fixture of water mill is clamped too tightly, resulting in concave round marks on the edges of holes on both sides of beads. If the grinding disc is not fixed properly, it will lead to car marks on the surface of beads.

2. Reason for handling: The handler was not careful enough, did not pursue perfection, and delivered the goods directly by serial number without checking the defects.