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Why can't the key open the door lock from the outside?

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    First, because the keys are new, the edges are angular and not smooth.

    Second, because the lock slot has not been used for a long time, professional maintenance personnel are required for maintenance.

     

    Selection indicators of anti-theft door locks:

     

    1. The material of the lock body is generally iron, steel, stainless steel, and zinc alloy.door hardware supplier ,Due to technical and cost constraints, the locking rod is not rigid enough and is often easily cut by powerful pliers and hydraulic pliers.

     

    2. The lock cylinder is generally made of copper. Copper is characterized by softness, and the use of electric drills and rough currents will destroy the copper lock cylinder.

     

     

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