Black metal knob.Diameter: 1 1/4"Thread: UNC #8-32.  Compatible with Converter Fasteners (Converter Fastener sold separately in either a 1 Inch or 2 Inch width). When used with Converter Fastener, there is no drilling required to install the knob.  Photo of kitchen is an example of Converter Fastener that can be used with almost any knob sold separately.