... stainless steel ,Hardened&tempered steel,cast iron ,aluminum ,copper ,brass and so on.2.Heat treatment :Harding andtempering ,high , ... frequency ,quenching ,carbnrizing quenching and so on.3.surface treatment:galvanizing/zincplating ,darotized ,black ... treatment ,spray printing ,mirror finish,brunishing,sand-blasting and so on according to ROHS demand.4.durable good ...
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