The surface burner knob is black and chrome in color with a red indicator line, and measures approximately 1 1/2” in diameter. The burner knob allows you to adjust and control the heat settings on your cooktop element. If your element is not heating properly, you may need to replace the knob. The knob is made of plastic and is sold individually. This is a genuine OEM part. Please note: As per the manufacturer, with the red mark at the 12 o'clock position the flat side of the D-shaft will be at the 3 o'clock position.