MIFAB® F320 Series floor drain with anchor flange, primary and secondary weepholes, and standard 1" (25) thick, 9" (229) round, ductile iron tractor grate.MIFAB® Series F320 floor drain with anchor flange, primary and secondary weepholes, and standard 1" (25) thick, 9" (229) round, ductile iron tractor grate.