The material can be carbon stell such asa c45 , 20crmnti , 40cr , 42crmo and so on or stainless steel or copper or nylon and so on .
The material can be carbon stell such asa c45 , 20crmnti , 40cr , 42crmo and so on or stainless steel or copper or nylon and so on .
The material can be carbon stell such asa c45 , 20crmnti , 40cr , 42crmo and so on or stainless steel or copper or nylon and so on .
The material can be carbon stell such asa c45 , 20crmnti , 40cr , 42crmo and so on or stainless steel or copper or nylon and so on .