Features: Ensure enhances security with our Impact Activated Self Closing Door Latches, designs to automatically lock door upon closing, providing peace for home or office. Crafted from aluminum with a rusts resistant coating, this Latches is build to last and for various door materials seamlessly. Suitable for homeowners, office managers, and businesses want to improve access control and security measure . Perfect for residential front door , office partition door , warehouse door , and any location requiring automatic Closures. Easy installation makes it a convenient choice for anyone look to upgrades their door hardware with reliable self closing functionality. Specifications: Material: aluminum Size: about 4x10x23x41mm/0.16x0.39x0.91x1.61inch Package Includes: 1xSpring Door Latches note: Please allow 1 to 3cm error due to manual measurement, please make sure you do not mind before you bid, Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.