... Metric NPT color: white black dark grey,green yellow 1.46 years of experience in metal processing, especially in ... on technical3. Excellent customer service.4. OEM service is welcomed.5. Material: cold rolled steel,stainless steel,galvanized steel,copper ... assembly line, cold punching line. More than 1600 advanced machines for punching, turing, milling, maching, weld, galvanizing, heat treatment and ...