M14 spark plug rethread repair tap & die set

Set of parts used for remaking the threads on spark plug recesses, according to the opening and thread pitch.
Box of screw taps and threads for remaking the spark plug recesses M14, M16 x 1.25 - 16 parts.
Contains stepped coupling M16 x 1.25 drive 17,
length 70 mm.
Threads 14 x 1.25 (142/17.5)