MATERIAL：Racewill Copper Nickel Alloy brake line is easy to be bent by hand and flare by simple tools.all brake line fittings are made of durable brass to prevent rust and plated for corrosion resistance. UPGRADE TO 20 FITTINGS: ① 2 x 3/16” (7/16-24) Inverted Tube Nut; ② 10 x 3/16″ (3/8-24) Inverted Tube Nut; ③ 2 x 3/16” (1/2-20) Inverted Tube Nut; ④ 2 x 3/16″(9/16-18) Inverted Tube Nut; ⑤ 4 x 3/16″ (3/8-24) threads unions RUST AND CORROSION PROOFING：Our 3/16 Copper nickel brake line are the longest lasting brake line and much better than steel tubing. Copper Nickel Alloy brake line are ideal for vehicles experiencing harsh weather and environmental conditions, lik… .