High QualityThe Door Chain Is Made Of High Quality Stainless Steel. The Surface Is Brushed, Which Is Not Easy To Rust And Fade To Ensure That It Does Not Rust And Has A Long Service Life. The Stainless Steel Security Sliding Door Lock The Chain Is Made Of 304 Stainless Steel. The Texture Surface Is Smooth, Corrosion Resistant And Prevents Raw Iron From Rusting. Sturdy And StableThe Sliding Door Lock Of Stainless Steel Security Door Is Made Of High Quality Stainless Steel, Solid, Durable And Never Rust; Likewise, The Thickened And Widened Chain And Panel Make The Door Lock Very Strong, With Gaps Between The Chains; Add Protective Leather After The Sleeve, It Can Effectively Protect Children'S Fingers And Prevent Children From Being Injured When Playing The Anti-Theft Chain Out Of Curiosity. Wide UseA Door Lock Chain For Revolving Doors Which Can Open The Passage To Ensure Safety. The Chain Lock Allows You To Partially Open The Door To Identify Visitors Or Receive Packages. The Chain Is Suitable For All Kinds Of Wooden And Metal Doors. For Homes, Hotels, Apartments, Rental Houses, Etc. Easy To InstallThe Latch Is Very Easy To Install And Strong. The Chain Door Guard Can Be Used On Different Types Of Wooden Or Metal Doors. It Can Be Placed Above The Door Panel Using The Four Mounting Screws Provided. Or Beside It, The Latch Is Very Easy To Install And Strong. Super SecurityYou Can Unlock The Door Chain Lock From Inside, But Not From Outside, Which Makes You More Safe At Home, The Edge Has A Round Shape, It Is Not Easy To Hurt Your Hands When Opening Or Closing The Door, And The Wall Groove The Rough Surface Increases The Fastening Force Between The Chain And The Door, Which Makes It More Solid. Others Cannot Open The Chain By Reaching Out From The Outside.