A. Sturdy Protection This door lock is made of aluminum alloy, offering good security. It is designed to resist forced entry and is a suitable choice for family homes and apartments. B. Child - Safety Design This door lock can help prevent children from opening the door without supervision, which is beneficial for protecting children's safety. This feature is useful for parents seeking more peace of mind. C. Easy Installation One can install this door reinforcement lock easily and quickly without the help of a professional. It is a cost - effective security option. D. Wide Application This door lock is suitable for various types of doors. It can improve the security of front doors, back doors, and interior doors, helping to prevent unauthorized entry. E. Precautions - Due to different product batches, there may be some differences in appearance and printed text, which generally do not affect the use. - Color: Black - Material: Aluminum alloy - Package contents: 2 security door locks - Only the above package contents are included, and other products are usually not included. - Due to light reflection and display differences, the color of the items in the picture may vary a bit from the actual product. The measurement tolerance is about ±1 - 3 cm.