allen bolt 1-STANDARD:DIN,ANSI,IFI,BS,GB 2-MATERIAL: carbon steel,stainless steel,alloy steel 3-THREAD:MM,UNC,UNF,BSW,coarse& allen bolt1-STANDARD:DIN,ANSI,IFI,BS,GB2-MATERIAL: carbon steel,stainless steel,alloy steel3-THREAD:MM,UNC,UNF,BSW,coarse&fine thread4-FINISH:Zinc,Balck,Nickel,Chrome HEX SOCKET BOLT allen bolt din912