... steel304,316,Alloy steel,PlasticDimensionM4-M100Surface treatmentZinc,Nickel plated,Black Oxide,HDG,Dacromet,etcPackingCartons + plastic bags+ ... products with high quality and good price.Our products are as following:Bolts: hex bolts, heavy hex ... nuts, weld nuts, square nuts, cap nuts.Washers: flat washers, spring washers, lock washers, structural Washers. ... You DIN 912 Grade 8.8 Black Hex Socket Screw