These stainless steel metric tube nuts are designed for use with 3/16" brake tubing. The outside has 10x1.00mm fine metric threads, and the inside is contoured to fit a standard concave SAE 45 degree inverted (double) flare on common 3/16" or 4.75mm steel brake tubing. This "long" version measures 15mm long from under the hex to the tip, with an unthreaded lead portion.
The inverted flare metric tube nut is most common on Asian and some late-model American cars. Not for use with convex DIN or ISO "bubble" flares. Sold in pairs. Tubing not included.