50mm (2") diameter knurled knob makes main jet changes quick and painless without any tool to remove the jet plug. Contructed of 6061 aluminum and black anodized. Directly replaces (D16316) the oem main jet nut on the float bowl. Fits most Dellorto carbs, VHSH, VHSB, KZ, Rok Shifter / GP, etc.
