Sliding Door Handle Materials: WINSOON black door handles internal made of high materials stainless steel material. Solid and well-made, with good rust and corrosion resistant. Superior finish provides greet touch feel. No sharp edges, and it will not scratch your hands. Door Handle Two Side Design: This handle set can be used on the interior and exterior of sliding door, the inside flush pull and the outside. The door can be easily opened wherever you are. It is a fabulous application for barn doors. Door Panel Thickness: Suitable for 35mm to 45mm thick doors. WINSOON pull handle sets can used interior or exterior doors. Suitable for barn doors, closet doors, garage doors, garden sheds, wine cellars, etc. Esay to Install : All the necessary hardware is included. Just drilling two holes in the door to install, no need to chisel the door, you can complete the installation in a few minutes. Service: If there anything wrong with this door handle, please tell us via Amazon email, our customer service will try best to solve your problem.