Pn# - ADT23 - 1pc Brass Brake Line Adapter for 3/16" or 4.7 MM to 1/4" or 6 MM Tubing, 12mmx1.0 Male to 10mmx1.0 Female, Hex Head 1/2", OAL 1.0". For Adapting 3/16" metric bubble thread10mmx1.0 to 1/4" metric bubble thread12mmx1.0. Check your sizes with a thread gauge - many threads look the same. These are all fittings used for 3/16 1/4 brake line - all the correct sizes for the cylinder, brake valve, rubber hoses, wheel cylinders, calipers and any other brake component. These are exact to the factory originals and have all the details - they are the correct size and shape with the correct color. This is a exact inline tube reproduction of the original.