T & E Tools J7405 Mini Outside Thread Chaser Capacity: 5/32" to 1.1/2"(4 to 38mm) 55 Angle HSS Blades HRC62 Hardness Tighten the tool slightly on the good threads then back it off over the damaged thread area to restore threads quickly & accurately Mini size enables use in confined areas- Length 2 1/2" Will work on all types of threads with diameters of 5/32" to 1.1/2"(4 to 38mm)