Buy Stainless steel part production tools / machine

I need tools to make stainless steel (Inox) part head. It is round shape on the head. I need machine for:

- Make round shape on the head with exactly radius.
- Inox part diameter from 1.10 mm, 1.5 mm, 2.5 mm.
- Fast and effective and cheapest production cost.
- Qty for each size per years is 100,000 Pcs.
- We have about 5 size.