20 inch length with invert flares. 1/4" O.D. polyvinyl fluoride (PVF) tubing. No.3003 (7/16". 24) tube nut on one end and No.3004 (7/16". 24 Long) tube nut on the other. Use with No.3005 unions (not included) PVF Tubing: Double walled and treated with double-sided copper coating prior to rolling. Double annealed for improved workability and easy bending. .028" tubing wall meets or exceeds OE specification for brake line tubing. Protected with zinc plating and polymer PVF coating to help shield against the corrosive effects of road abrasion and road treating chemicals. Used as Original Equipment tubing by VW/Audi, Mercedes, Toyota and Honda. Zinc plating thickness specification 13mm (1.013mm). manufactured to 13.7-14.4mm (0.0137-0.0144mm). PVF coating thickness specification 15mm (0.015mm). manufactured to 20-22mm (0.02-0.022mm).