... treatmetnNickel,white/bluezinc,black oxide7Heat treatmentsoft, case harden, Grade4.8,6.8, 8.8, 10.9, 12.9, andso on.8StandardDIN ... inch size11MOQ500000pcs12SizeIt‘s up to the client‘s requriment13Head typesPan head,round head,round washer head,recessed head14Drive typesSlot, Phillips, Phillips tamper-resistant, Slot and ...