... , and plating 2) We make them by precision casting, investment casting and steel sand casting process ... supply carbon steel, stainless steel and alloy steel precision casting part. and supply chasing ,heat treatment, ... equipment (machine shop used): vernier caliper, depth caliper, micrometer, depth micrometer, raius caliper, digital caliper, digital depth caliper, ID micrometer, OD micrometer, multiple ...