This Mini Outside Thread Chaser or restorer is made T&E Tools.
It has 55 degree Angle HSS Blades, and
Hardness. Simply tighten the tool slightly on the good threads then
back it off over the damaged thread area to restore threads quickly
& accurately. It's mini size enables use in confined areas-
Length 2 1/2". It will work on all types of threads with diameters of
5/32" to 1 1/2"(4 to 38mm).