... 0.5mm to 15mm; 4.surface treatment: zinc plated. High quality stamping parts for auto car1) material of stamping part:steel ... ;7) Other Production equipment: bending machine, nibbler, hydraulic machine, table drill;8) surface treatment: zinc plated, powder coating, painting, ... never late than settled. ( expect for force majeure.)7. Quality control:-------------- Both in-house QC and lab test provided. ...