Blind rivet nuts with a small countersunk head create a load-bearing metric thread where none can be cut: in sheet metal, tubes, and closed profiles. Knurled round shank, with underhead serrations, open shank end—can be set from the front on one side, without access to the rear. Available in Stainless steel V2A (AISI 304) (M4–M10) and galvanised steel (M5–M10). Drill diameter 6.0 to 13.0 mm.