... size,little volume,easy move.3.low maintenance cost: no fragile, expensive tubes;4.special security, no pressure, eliminating the high ... .4.Hardware: the pre-forging for screws and nuts, silver soldering for lathe tool, the soldering for air gauge, the temper of ... pontil, the hardening of surface for high tensile screw, epoxy powder coating for locking nut etc. low price of induction heat machine ...