1.There is no material in our warehouse.We purchase materials according to the part size after receiving the customer's order every time.

2.After the material arrives at the company, the material supplier will attach the invoice.The staff will mark the material with a white pen.

3.The warehouse management personnel of our company will check the types and sizes of materials according to the invoices, and attach the processing drawings to the materials.

In this way, there is little possibility of getting the material wrong within the company.