Knurled control knob in black glass fibre reinforced polyamide-based technopolymer with light grey acetal-based technopolymer boss cap, push-fit assembly and removable by pressing on the outer edge.
Option to have plain knob, knob with matte anodized aluminium flange and triangular black index, knob with matte anodized aluminium flange and graduation in black with 40 marks or 100 marks.