Features:【Effective Security】: This double lock door safety cylinder is designed to efficiently prevent breakage, collision, and drilling, ensuring maximum security for your front door.【Anti-theft Function】: With an anti-theft function, this lock greatly enhances the reliability and safety of your door, providing you with peace of mind.【Multi-way Lock Principle】: By adopting the multi-way lock principle, this cylinder prevents drilling locks and grasp keys from opening, providing a further layer of protection.【High-quality Material】: Made of effective aluminum alloy, this lock core is and immune to rust, making certain long-lasting performance.【Easy Installation】: This security cylinder is simple to put in and fits most entrance doors, making it handy for either householders and locksmiths.Specifications:*Product Name: Double lock door security cylinder key anti-theft entrance door lock extension core*Material: Aluminum alloy + copper*Size: 70*29mm*Color: silver, goldPackage Content:1 x lock cylinder3 x keys1 x screwNote:1. The genuine color of the item may be slightly diversified from the photographs shown on web page brought on by many points comparable to brightness of your display screen and light brightness.2. Please allow slight handbook measurement deviation for the data.