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bob@cxyinrun.com
1.Anut combination of a concave at upper and a convex at lower
2. When the upper nut is tightened to a reasonable torque, the lower nut willcompletely lock the bolt and achieve permanent anti-loosening.
3. A large contact surface of the lower nut and the bolt is designed to enhancethe anti-loosening performance and the tensile strength.
4.Indefinitely recycled.
5.Competitive price over theimported brands
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