... 2.special light: small size,little volume,easy move.3.low maintenance cost: no fragile, expensive tubes;4.special security, ... for stainless steel tube, cramp iron, epoxy powder coating for steel tube, the hardening for the high tensile cramp iron, the heat-fusion for ... pontil, the hardening of surface for high tensile screw, epoxy powder coating for locking nut etc. low price of induction heat machine ...