Fit Keihin CVK or CTK carburetorsFully CNC-machined billet construction with precision diamond knurl patternFast installation - just remove the stock black plastic unit found and screw in the Joker knobInclude stainless steel threaded (M4 X 0,7 mm) studWill work with the new 2009 EFI - CTK ''carbs'' with the two-stage fast idleKnob measures 21 mm (0,86'') outside diameter, 25 mm (1'') in length