Stainless Brake Line Fitting for 3/16" or 4.50 MM Tubing, Thread 3/8-24, Hex Head 3/8", OAL .560, Length of Thread .350, Finish Stainless. The most common brake line fitting used. GM9432075 12pc SAE 3/16 tube size x 3/8-24 thread size Stainless Steel Brake Line tube Nuts for 3/16" Steel Brake Line Tubing Inverted Flare Standard 3/8"-24 thread Equivalent to 105B, 121003, 105X3, 90002, 785-460, BR105.