Safety door locks are an important barrier to protect family property. Therefore, it is necessary to pay great attention to its anti-theft property. At present, good safety door locks use steel as the main material instead of the cast iron in the past. Some imported locks are made of a material called “powder carbon steel”, which has superior wear resistance and can bring greater safety to the family. At the same time, pay attention to the anti-theft level of the security door lock, try to choose the door lock with high anti-theft level.