DIN/ASTM bolt 1.carbon steel,alloy,al,cu,SS,etc 2.zinc,black,HDG.etc. 3.also as the customer need. 4.bulk in cartons,PTS. DIN/ASTM bolt1.carbon steel,alloy,al,cu,SS,etc2.zinc,black,HDG.etc.3.also as the customer need.4.bulk in cartons,PTS. astm 325bolt