Stainless steel handle material precision machined, generous classic, simple style for home and public facilities fire safety doors, decorative interior doors, such as size diameter 19mm, 22mm, for 1.2mm thick arm to wear to prevent the lock bolt fixed effective finishing up with loose seat effective in preventing finishing up spring down in line with fire safety, security functional requirements, such as surface treatment for stainless steel wire drawing, polishing, plating pvd, metal paint, such as the scope of application of the door thickness 35-55mm.