Undercoating Gun Spray Wand Kit Set of two extension wands for use with Model RA1/T Undercoating Gun (sold separately) (1) Rustproofing wand to atomize rustproofing in hollow beams, cavities and inside doors. (32 inches long, OD 10 MM (3/8") , ID 5 MM (3/16") and M11x0.75 thread) (1) Undercoating wand to spray undercoating in hard to reach places, i.e., behind mufflers and around exhaust pipes. (24 inches long, OD 10 MM (3/8") , ID 5 MM (3/16") and M11x0.75 thread)