These Banjo's were designed for Wilwood master cylinders as shown to allow standard 3/16" brake lines to connect to the master cylinder 90 degrees to the ports, without any other fittings.
They're a great low-profile option for tight spaces, and offer clean looks in your engine bay.
NOTE: They come as a PAIR, and are threaded for a 3/16 brake line nut (3/8-24 thread).