Features and Benefits: Restores and cleans up threads on nuts, bolts and studs Internal range: 5/16 in. - 5/8 in. (M8 - M16), External range: 1/4 in. - 3/4 in. (M6 - M18) Tools automatically adjust to thread diameter and pitch Can be used on both RH and LH threads, both inch and metric as well as co....(more info)