about this article Made of high quality 304 stainless steel, solid construction, brushed finish surface, aesthetic appearance, rust and corrosion resistant, sturdy and durable to use, long service life. Integrated switch design is easy for daily use, say goodbye to the one with "push just ride and slide" type, this type of lever with comfortable touch and hidden style will surely offer you a pleasant use and will match your modern decoration. The specially designed door bolt, provides powerful and professional protection for your home, suitable for all kinds of wooden doors in your house where you need to lock. Beautiful and practical - Hidden flush bolt locks, most doors are applicable. Pleasant aesthetic appearance with a truly excellent satin finish. Easy to install, comes with rust-proof screws and surface studs for installation. Constructed of stainless steel, the screws will provide extra strength to engage and snap together tightly so it won't move. Product Flush bolt is ideal especially for French, patio, wood, double or other composite door jamb, provides concealed locking for dummy doors and inactive doors. Constructed from strong materials, it is sturdy and reliable enough for everyday residential use. This mechanism comes with a reasonable interior design, don't worry about breaking suddenly when using. With a comfortable touch and a concealed style, it is sure to give you a pleasant use and perfectly finished to complement your decor. Recommend to buy two for the top and bottom of the door. Installation Instruction: 1.Figure out where to install the flush bolt (usually on the inactive leaf of the double door opening) and drill the grooves. 2.Install the flush bolt on the door leaf and tighten each screw. Align the strikers on the door frame or on the floor and drill holes, then tighten each screw. 3.Close the door, put the pin in the hole, done