... Bolts Screw Fasteners. 1.What’s the specification of our Products ? MaterialCarbon steel,Stainless steel,Alloy steel,Copper,Aluminum are available.Carton steel ... 1022,1018,1010,1008,1015...Medium carbon steel are 35k,45#,10B21,1035,CH38F, ... ,Countersunk head,Bugle head,Oval head,Hex flange head,Round head,Ball head, ... type,Torx type,trangle type,slotted point type,square type,Combined type...FinishZinc ...