pop rivet nuts of different size, stainless steel mandrel on the left edge of the shot on black tectured chalk board surface.

2020 air airtight background black blue bolt bow box carving chiselling classic closure collar connection copy detail enclosure engineering fastener grange grey guard hard hardness high horizontal imagery inner inside internal left metal monochrome nut oblong pack ring riv rivet rivnut rustic screw scrimshaw span surface technical thread top trend view