... , heavy hex bolts, hex flange bolts, carriage bolts, stud bolts, eye bolts, U bolts, masonry bolts, roofing bolts.Nuts: spring nuts ... 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