1) ISO9001:2000 2) anode dia is 16mm~21mm, 21.3mm, 22mm, core dia is ... core dia of Bar-type anode that you need, we can machining according your demand. Main application: water heater, water container, pre-polarization of ... and iron structure where high resistant and electrolyte (soil and water ) existed Best regards, Shi LipingSHANXI PROVINCE YANGQUAN METALS & MINERALS IMP ...