MIFAB® F300 Series floor drain with anchor flange, primary and secondary weepholes, and standard 1" (25) thick, 7" (178) round, ductile iron tractor grate.MIFAB® Series F300 floor drain with anchor flange, primary and secondary weepholes, and standard 1" (25) thick, 7" (178) round, ductile iron tractor grate.