Features:【Effective Security】: This double lock door security cylinder is designed to efficiently prevent breakage, collision, and drilling, making certain most safety for your front door.【Anti-theft Function】: With an anti-theft function, this lock significantly 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 an extra layer of protection.【High-quality Material】: Made of superb aluminum alloy, this lock core is and proof against rust, guaranteeing long-lasting performance.【Easy Installation】: This safety cylinder is easy to install and matches maximum front 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 coloration of the article could also be slightly different from the photographs shown on web content brought on by many points similar to brightness of your monitor and lightweight brightness.2. Please enable slight manual size deviation for the data.