Okw dials for roundwing knobs transparent with graduation scale okw a 44 16 020 this okw a 44 16 020 dial for roundwing knob 16mm transparent with graduation scale has been manufactured with pc ul 94 hb material and can be fitted with ease onto a 16mm roundwing knob okw a 44 16 020 dial for roundwing knob 16mm transparent w bk graduation