... such as 1022,1018,1010,1008,1015...Medium carbon steel are 35k,45#,10B21,1035,CH38F, ... type,Eleven type,hexagonal type,Torx type,trangle type,slotted point type,square type,Combined type...FinishZinc plated,Nickel plated,Dacroment Plated,chromium plated,Tin plated,Blackphosphating ,anodized ,and ... places such as drywall,concrete,chipboard,machine,wood...2)Main export market:North America,South America, ...