DAVIES 1900H CLONE knob Plastic knob with 1/4'' set screw. Color: black,white,cream,red,green,yellow,blue... Meet ROHS. DAVIES 1900H CLONE knobplastic knob with 1/4'' set screw.Color: black,white,cream,red,green,yellow,blue,brown,orange, purple.Meet ROHS. DAVIES 1900H CLONE knob