A super useful tool for repairing damaged threads These hand tools automatically adjust to any diameter and pitch, can be used on left-hand or right-hand threads, both inch and metric, and need no prior measurement of the thread. The blades are made of high-quality hardened tool steel (internal tools' blades - HSS, external tools' blades - O1). The blades are guided by the existing undamaged section of thread, in order to regroove the damaged section. Visit the link below to try it for yourself…