We are able to supply our products in two types of Steel, AISI 304 stainless steel or Marine Grade AISI 316 stainless steel. The grades relate to the composition of the stainless steel. AISI 316 is also known as “Marine Grade” stainless steel due to its higher level of nickel and the addition of molybdenum. AISI 316 due to its durability is perfect to use in areas where it is exposed to harsher environments. Therefore, AISI 316 stainless steel is generally recommended for external applications and AISI 304 for internal use.