... Hollow Bolt,Stainless Steel Hollow Bolt,Bolt with Internal Thread.1.What’s the specification of our Products ... are available.Carton steel is high quality iron,such as 1022,1018,1010,1008,1015... ... demand .Threads/ScrowsType "M","UNC","UNF","BSW"thread are available. Head typesHexagon head,Mushroom head,Pan ... in customer's hands .2.Recently,several New quality control equipments had brought to Enhance the ...