DIN7991 BOLTS 1)TREATMENT: BLACK TREATMENT 2)PACKING TERM: 25KG CARTON,BULK,ACCORDING TO CUSTOMER 3)SIZE: FROM M8-M30 DIN7991 BOLTS1)Material:carbon steel or alloy steel2)SIZE:FROM M8-M303)8.8 GRADE,10.9GRADE,12.9grade4)TREATMENT: BLACK TREATMENT5)PACKING TERM: 25KG CARTON,BULK,ACCORDING TO CUSTOMER DIN7991 Bolts,10.9,12.9grade