Quality Assurance: Sliding Door Mortise Lock Set: Zinc alloy with silver anti-corrosion powder coating finish. Lock cylinder: copper. Keys: copper. Size: Handle size: length 175mm, width 45mm. Lock body: length 82 mm, width 57 mm. (For details, please refer to the picture). Wooden sliding door lock, invisible handle: Works on door panels 35-50mm thick. The sliding door lock fits left or right door. Wooden door lock with key: It can be bolted inside or locked outside. When bolted inside, it can be unlocked by key from outside.We Promise: We are guaranteed 1 year warranty. If you have any questions, please contact us FIRST, we will get back to you within 8 hours, solve the problem for you until you are satisfied.