Iron fastener, another name carton steel fastener, including bolts,nuts,washers,rods,studs,pins,screws and so on.The material of them is stainless steel.Such as SUS304,SUS316,ect.Grade:A2-50,A2-70,A4-70,A4-80.Applications: machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, meters and supplies ect.