One handle by Tomas Berrio by thomas berrio from usa

This door handle concept consists of two main parts; one of them is the enclosing component, which also serves as the handle for both sides of the door. Like in most common doors, this concept facilitates access by turning the handles. To lock door from the inside, simply turn handle to the left and pull. Turn back to the left and push to unlock. This concept is easily adaptable to most types of doors. Installation process is simple and only requires one screw. Casing preferably made out of formed stainless steel or aluminum.