Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! A groove is machined into the outside of the adapter for use with a retainer clip These stainless steel fittings adapt from M10x1.0 inverted flare female to -4 AN flare male and are perfect for connecting the stainless braided hoses to the stock or upgraded brake wheel cylinder or caliper Size: AN4 male to M10-1.0 female inverted flare, pack of 1. Manufactured from stainless steel Ideal for use with brake lines, clutch lines, turbo oil feed, oil pressure, coolant, and power steering systems, Manufacturer: PokFhgur