Will the nut rust if it sits for a long time?
NO. Rivet nuts is made of carbon steel, with surface galvanizing, corrosion-resistant, rust-proof, and can maintain good performance in harsh environments.
Are all the rivet nuts accurate in size and are they subject to error?
EilxMag rivet nuts assortment kit are dimensionally accurate and compress properly.
Does the nutsert kits come with metric screws only?
Rivnut kit come with both metric and fractional rivet nut, which seems to be a good balance between quantity and variety, with a variety of each rivet nuts just in case.