Use the Precision Raceworks Vice Jaws for AN Fittings to make DIY fuel lines an easy chore!  These simply attach to your existing 4″ vise using the included magnets.  You then tignten your jaws on the an fitting you are trying to install!  Helps prevent marring your fitting while tightening!  Pair it with a set of AN wrenches to install fuel line fittings like a pro!