... Stainless Steel Hollow Bolt,Bolt with Internal Thread.1.What’s the specification of our Products ? MaterialsCarbon steel,Stainless steel,Alloy steel,Copper,Aluminum are available.Carton steel ... 2.Our company had good reputation with customers from American,Europe and Asia etc.We also have a ... control .3.Certificate:Provide dimensions report,chemical report and other testing report .Good service We can ...