Material : AISI304, AISI316L Type: Elliptic,Circule, square Standard: 3A/DIN/SMS/ISO or as per drawing Finish:Mirror Color santiary square manhole coverType:circular or square or Elliptic typeMaterial :SUS304, 316L, 321,304L, 316Size :OD300-OD600 for Circular Cover435X534 or φ435*335,φ535*415 for squareFineness:inner and outer fineness of mirror Ra≤0.8μm, inner and outer mechanical polish and ...