These two clips are recorded at a complete machine-regulated factory. After machine-regulated manufacture, the spindles would be sent to the testing machines which ensure the quality of spindles while tossing the ones that do not meet the quality standards. The entire production line is regulated by machines, which removes any concerns of quality issues, limit the tolerance interval within 0.015mm

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While the Roller is being twisted, the precision measurement pointer barely moved

Here are couple pictures of our factory, we have quality check machines that exam each item after each manufacturing procedure to eliminate the tolerate interval in every single detail.