This Mini Outside Thread Chaser or restorer is made T&E Tools.
It has 55 degree Angle HSS Blades, and
HRC62
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).