High quality materials: Our inner door ball lock is made of high-quality materials, including a solid copper base, strong elastic springs, solid , durable 1-1/4inch long brass valve body, and rust resistant stainless steel striking plate. The service life of this lock is at least 5 years.Custom dual adjustment: This door button hardware replacement can be customized and adjusted. You can change the length of this invisible door latch by rotating the baffle around the threads on the brass body to fit the door seam. Rotating the bottom can control the compression force of the ball to obtain appropriate strength.Invisible design: This spherical lock door hardware needs to be installed on the side of the door panel, and after the door is closed, it will be invisible. You can choose a lock catch of the same color as your door. For dark colored doors such as black or brown, it is recommended to choose black.Easy to install: Installing a latch only takes 5-8 minutes. There are two installation methods, and you can install the latch on the top or side of the door panel as needed.Lock size: The panel size is 1 inch W x 2-1/8 inch H. The brass valve body size is 8/12 inch diameter x 11/10 inch deep. The size of the anti-skid plate is 1-3/8 inch W x 2-1/8 inch L. Including fastening screws.(Please measure the dimensions before drilling the brass ball.)Colour:BlackMaterial:stainless steel + brassPackage Contents:4 * Ball CatchOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.