Excellent materialMade of copper, it is sturdys and durable.Made of high-quality copper, it has strong corrosion resistances and is not easy to rust. Anti-theftSignificantly enhances the anti-theft and ease of use of the lock cylinder.The strong material made the thief helpless. The lock core using multi-ways lock principle, using a variety of institution of mechanical abnormity, prevent lock from drilling and masters keys opening. It can against theft function effectively improved the reliability and safety of the lock, is your first choice for security. Application Suitable for metal doors, anti-theft doors, standard doors. The friction coefficient between the surfaces of the material is small, long service life and good reliability. Specifications: Material: Stainless Steel+ Copper Applicable Door Thickness: Approximate.35mm/1.37 Inch Weight: 95g Note: Please allow 1-2cm errors due to manual measurement,Please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 set Cylinder Lock Core