... Fastener ,screws and fasteners ,fasteners bolts nuts screws .1.What’s the specification of our Products ? MaterialCarbon steel,Stainless steel,Alloy steel,Copper,Aluminum ... iron,such as 1022,1018,1010,1008,1015...Medium carbon steel are 35k,45#,10B21,1035,CH38F,1039,40ACR...Alloy ... products!Welcome to call me any time !Tel:+86-15917002605 Carbon Steel Stainless Steel Screws and Fasteners Bolts Nuts