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The 3D viewer (A360 Viewer) we use to display models is currently experiencing issues, and links may not be accessible. Our technical team is currently working to resolve the issue.
In the meantime, you can download the source file (if available) or contact our support team for further assistance.
A door handle or door knob is a mechanism used to open or close a door. The traditional door knob has a bolt or spindle running through it that sits just above a cylinder, to which the spindle is connected.