There are many kinds of crescent locks. High quality crescent lock in the hand weighing heavy feeling; The appearance is smooth, without pitting; Crescent locks can generally rotate 180 degrees (some can rotate 360 degrees). High quality crescent locks are more flexible and free to rotate, with no noise and good elasticity; Looking back, good crescent locks are mostly spring structures. The center material is galvanized, not easy to rust; From the thickness of the material, it is relatively thick.

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