... Material:carbon steel,stainless steel screw 2.Finishing:zinc,black oxide 3.Standard:DIN.ANSI/ASME.JIS steel ... ,carbon steel,brass,aluminum,stainless steel6Surface treatmetnNickel,white/bluezinc,black oxide7Heat treatmentsoft, case harden, Grade4.8,6.8, ... recessed head14Drive typesSlot, Phillips, Phillips tamper-resistant, Slot and Phillips combo, Square,Square recessWe are china factory,we have the ...