... corrosion resistance, extend usage life 1-3 times. Mainly for surface hardening, like cold stamping, forging & pressing, bending, extrusion, stretching, die ... processing depth.4.Working pump is attached in the machine. XKS-350 hardening machine processing effect:1.Processing any broken parts & screws ... of stockOut of stockIn stock XKS-350 Electro spark intensify machine, surface harden machine