High quality material: : The anti-theft door lock is made of durable stainless steel, the surface is polished, it has excellent rust and corrosion resistance, is strong and not easy to break. Unique design: : Mortise Door Bolt is inserted into door or window frame instead of surface mount. This can hide them and provide an additional point of protection. Security: : Thickened panel and solid stainless steel bolt design make the door security frame bolt lock stronger and more durable, and can be firmly installed and locked. Easy to install: : They are easy to install and use. You just need to find the location and mark it, then install it. Large application: : The stainless steel security door latch can be applied to most doors and / or windows, and is usually installed in pairs near the top and bottom of the door to increase additional security.