... Nuts Bolts Screw Fasteners. 1.What’s the specification of our Products ? MaterialCarbon steel,Stainless steel,Alloy steel,Copper,Aluminum are available.Carton steel ... iron,such as 1022,1018,1010,1008,1015...Medium carbon steel are 35k,45#,10B21,1035,CH38F,1039,40ACR...Alloy ... head,Hex flange head,Round head,Ball head,Button head...Socket typePhillip type,Pozi type,Eleven type,hexagonal type,Torx ...