dewhel 54mm 4 star maunal gear shift shifter knob m12x1.25 m10x1.5 m10x1.25 m8x1.25 dewhel shift knob. 54mm or 2.12 inches diameter. transparent amber aclyalyic with red stars in knob and smooth to the touch light scratch resistant aclyalyic<br>shifter knobs are made with a threaded metal insert in them, no plastic threads that can be crack or damaged and become useless.