EP-300D electrolytic polishing machine is Yihui Casting self-developed electrochemical polishing equipment for jewelry. Based on electrolysis principle,it achieves mirror finishing on metal surfaces,removes burrs,oxide layers and casting defects efficiently. It realizes dead-angle-free polishing for rings,pendants and hollow engraved jewelry. Uniform and stable polishing quality reduces hand finishing cost. Compatible with gold,K-gold,brass,stainless steel and more metals. Ideal post-polishing machine for precision jewelry casting lines.