2D/3D drawings, product quantity, material, surface treatment and special requirements.

Yes, samples are available. Calculated by working hours, which can be refunded when mass production meets the standard.

500-1000 pieces for standard parts, 100-500 pieces for non-standard parts, and 50 pieces for precision small parts (negotiable).

Incoming inspection → process control (first article confirmation) → finished product inspection (full inspection of function, appearance, and packaging according to AQL standards) → disposal of non-conforming products. Quality engineer determines "concession acceptance, rework, scrap" → shipment release. QA manager verifies that all inspection records are complete and qualified.

1. Acceptance and registration: The customer service specialist will respond within 2 hours.
2. Problem classification and circulation
3. Reason analysis and solution
4. Customer confirmation
5. Closing and Archiving.