Do heat treatment on the steel surface to avoid steel rusting. precision machining parts 1) cnc machining parts, ... parts, precision parts2) Material: brass, titanium, aluminum, stainless steel, lower-carbon steel, and so on.3) finish: zinc plated, chorme, ... , peripheral milling machine, top circle grinding machine, punch, guillotine shears, bender, high/low- speed wire cutter, EDM Wire machining, ...