... .ISO factory StandardISO,JIS,GB,ANSI,BSW,DIN or non standard as customize. MaterialCarbon steel,Stainless steel304,316,Alloy steel,PlasticDimensionM4 ... screws, self tapping screws, self drilling screws, set screws, hex socket head cap screws, wood screws.Rivet: solid rivet, blind rivet ... Choice for You DIN 912 Grade 8.8 Black Hex Socket Screw