Door knobs was widly used with their simple,elegant appearance in different kind of door ,like wooden door , glass door ,bathroom sliding glass door,material can be solid brass ,stainless steel , zinc alloy,
 How to choose sutiable door knob ?
It depend on where those door knob will be installed , with the humidity condition like bathroom sliding door, stainless steel door knob is your perfect choice, if you want to show retro style of your wooden door , a solid brass door knob can achieve this effect. withou enough budget? don't worry ,zinc alloy door knob can help you get what you want.