Stainless steel bolt 1, spec.: 12-50mm, wall: 0.8-2.0mm 2, ... ,AMSE 3, material: INOX AISI304,304L,316,316L Stainless steel bolt 1, The material can be SUS304,304L,316, or 316L ... at their own ends inside which there's a EPDM rubber ring: this has a very strong resistance against aging, it ... government buildings, classy hospitals, star hotels water supply projects. hex bolt