The new and practical drop-proof device plays the function of ensuring safety of the scaffold in the course of lifting up and down.

实用新型的防下坠装置在架体升降过程中起到保证安全的作用。

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The combined screw has the advantages of the easy processing, the convenient use and the good drop-proof and loose-proof effects.

该组合螺丝具有易于加工、使用方便、防脱落松动效果好的特点。

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Its fully sealed design protects internal components, making it drop-proof, shock-proof, spill-proof, dust-proof, and watertight.

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