We always use Stainless Steel AISI316 Marine Grade to make our Stainless Steel products; however, if you need Stainless Steel AISI304 ones, please let us know in advance.
Stainless Steel AISI316 contains Molybdenum for more corrosion resistance, but of course, much more expensive; Stainless Steel AISI304 doesn't contain Molybdenum, and is a more subtle and cheaper choice in cost.