After several decades of development, more and more compression latch products, from the original handle slowly transition to the flat handle, the surface treatment from the original single plating treatment, and gradually extended to the current matt plating, spraying, nano Spraying, etc., the structure from the original turn the tongue lock to a tight lock, compression, connecting rod, etc. can improve the protection level of change and development,improve the door lock and corrosion resistance.Throughout the development of the international development of the country. China also has a lack of anti-theft of the lock core, the appearance of the shape is not beautiful defects. The future development of the need to lock the parts on the GM and the changes in the development of the cylinder, the material on the need to environmental and economic development, as far as possible the resources of the less waste and recycling.