HERE IS A  BRASS ADAPTER FOR THREADING IN A STEEL BRAKE LINE TO A MASTER CYLINDER WITH A LARGER THREAD 

THIS  SIZE IS ;

• female Tube Size: 3/16" (3/8-24)
• male Tube Size: 1/4" (7/16-24)

THIS AUCTION IS FOR ONE PIECE

A 3/16"" BRAKE LINE THREADS INTO THIS FEMALE PART

PLEASE SEE MY OTHER AUCTIONS FOR DIFFERENT SIZES