37 Degree Add On Flaring Tool Die Set - For 3/16", 1/4", 5/16" and 3/8". This is the 37 degree single or double flare add on tool to the TLF08 Tool. Must Be Used with TLF08 Tool. This is for 37 single or double flare and or JIC fittings a must for hot rod or street rod plumbing.