... Diameter: 5/8", 1", 1.5", 2", 3", 4" Application:Use as tower packing Size customized Metal pall ring ... Technical data of metal pall ring: Diameter (mm)Dimension d×h×δ (mm)Specific surface area (m2/m3)Void volume(m3 ... Φ1616×16×0.43710.933457214000527Φ2525×25×0.52190.95025551940393Φ2525×25×0.62230.94026851940471Φ3838×38×0. ... ×100×2.0350.955531200371 Metal pall ring (Dia.16, 25, 50, 76, 100mm)