Fineness:inner and outer fineness of mirror ra¡¨¹0.8|¨¬m, inner and outer mechanical polish and electrical polish ra¡¨¹0.2|¨¬m, external surface can be gross polished or sub-gross polished . Material:304, 304l, 306, 316l, 321 Plywood case Size&thickness:|Õ19.1*1.5mm-159*3mm Length:4m, 6m, 12m