【Reliable Security Door Lock】Doors and windows can be secured with special sliding door screws, ensuring reliable intrusion protection and providing sufficient strength and stability for each door/window. The knob saves effort, can be moved up and down, and can be easily opened, creating a safe living environment for you. 【High-Quality Stainless Steel Screws】Includes 2 solid bolts made of high-quality 304 stainless steel with a brushed finish for a metallic look and feel. It is not easy to oxidize, has strong corrosion resistance, and can be used for a long time. 【Concealed Design】The large latch is 15 cm long and can be installed in the door frame. No mechanical parts are visible. The mechanical parts are completely hidden when the door is closed. This concealed style is easy to use and complements your modern decor. 【Easy to Install】Each screw set comes with 4 rust-resistant screws and 1 fixing washer. The screws are made of stainless steel and come in two sizes. The longer screw is