Rotary knobs made of plastic, type OKW TOP-KNOBS A 10. Consist of the knob with recess for one of the four marker versions (available on separate order) which also cover the side screw fastening in the recess. The knob is made of polyamide (UL 94-HB). The 40 mm knob diameter version is also available for 6.0/4.6 mm. Shafts flattened on one side at the ends. The marker kit (available on separate order) can be replaced and is compatible with all knob sizes. The colors of the marker kit are clearly perceptible, with modern and smoother signal effect compared to standard signal shock colors. The knobs are available in gray (Vulcan) or black (Nero). With 20 mm knob diameter, type A 10. Technical attributes (type, shaft hole SH, color): A1020068, SH 6.0 mm, gray