Choke KnobsFit Keihin CVK or CTK carburetors Fully CNC-machined billet construction with precision diamond knurl pattern Fast installation - just remove the stock black plastic unit found and screw in the Joker knob Include stainless steel threaded (M4 X 0,7 mm) stud Will work with the new 2009 EFI - CTK "carbs" with the two-stage fast idle Knob measures 21 mm (0,86") outside diameter, 25 mm (1") in length Material: Billet AluminumProduct Name: Choke KnobUnits: EachColor/Finish: Clear