The 450-3031 is a red color top on a black knurled plastic knob with a white indicator.
This knob will fit on 5.33mm ( 0.21") shafts. Diameter outer 16mm (0.625") and height is 15mm (0.59").
Home/Electromechanical/Knobs/High Visibility Color Knobs/450-3031 Black Knurled Knob with Red top and White Indicator Line - 0.625" dia.
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