Features: 304 stainless steel construction with multi-layer coating, it is corrosion resistant and very durable. Can provide the highest level of residential security and control function from both sides. The surface is made with drawing process, which is beautiful and practical. The lock core and panel are integrated together, it is convenient to install. It is widely used in front and rear doors, such as solid wood doors or steel wooden doors. The internal components are made of galvanized steel and the external parts are constructed of stainless steel. The locking collar is free to rotate and can prevent breakage. Anti-saw lock tab with 25 mm / 1 in extension. Made of die-cast zinc alloy and built-in high-strength anti-saw lock core. Equipped with 5-hole marbled copper lock core and 3 mechanical keys. The interior and exterior are opened and closed with one key. Left and right open doors are available.The applicable door thickness is 35-50mm/1.38-1.97in.The center distance of the lock body can be adjusted to 60mm/2. 4 inches or 70 mm / 2.8 inches. Specifications: Item Type: Door Lock Material: Stainless Steel Color: Silver, Red Bronze (Optional) Applicable Door Thickness: Approx. 35-50mm/1.38-1.97in Center Distance of Lock Body : about 60mm / 2.4in, about 70mm / 2.8in(adjustable) Applicable door direction: Door left open, door right open Lock tab extension: about 25mm / 1in Function: Double locks are locked. Both inside and outside are opened and closed with a key Package list: 1 x double head lock 1 x lock body (adjustable center distance) 3 x key 1 x mounting plate 1 x set of screw 1 x instruction manual