Size:64*60mm,21*19mm Security & Privacy Swing Bar Door Locks Are Security Locking Devices for Swing-In Doors, Allow People Inside The Room To Open The Door Few Inches for Identification or Ventilation While Providing Privacy and Security for Guests and Residents. Door Latches Also Can Be Installed Out of Children'S Reach So They Can'T Open The Door By Themselves, Providing Additional Child-Safe Door Security. . Premium Quality The Latch Is Made of High-Quality Solid Zinc Alloy, Which Is Durable and Not Easy To Rust. The Surface Is Polished for Beautiful Appearance. The Thickened Bottom Plate and Thick Head Lock Material Are Strong, Not Easy To Break, and More Secure, Ensuring Your Family Safety. . Advanced Craft Features The Rotating Shaft Is Equipped With Precision Steel Balls, and The Position of The Third Gear Is Adjusted, and The Door Lock Is Opened and Closed More Smoothly. The Base Panel Is Thickened, and The Screw Holes Are Fixed At Three Points To Make The Latch Installation More Secure. . Easy Installation The Installation and Operation Is Simple, You Only Need A Screwdriver, After Making The Mark, Tighten The Door Lock With Screws.