This jet is used as a main jet for Dellorto FHBB, OVC, PHBE, PHBH, PHBL, PHBN, PHF, PHM, PHSB, PHVA, PHVB, SHB, VHSA, VHSB, VHSC, VHSH, VHST, Carburetors The thread on this jet is 6mm.