Note: F-243 is my inventory # only. Here is a nice, barely-used Armstrong USA No. 4112, 3/8″ flare nut/tubing/line wrench. If you work on hydraulics, fuel lines, with tubing, etc…you need this handy wrench in your tool box or on your service truck. Handle is 3/8″ round diameter. The opening to slip over a line diameter is approximately 9/32″. USPS First Class Shipping to 50 US States Only.NO Foreign Shipping.