P/n 4212-125

M12x1.25 spark plug repair kit 4212-125 included 5 inserts.
(Qty 2)  9mm p/n 42121  (Qty 2) 15mm p/n 42123 (Qty 2) 17.5mm p/n 42125
The wrench which is the black tool 4-5/8″ inch or 117mm rotates all the tools, has a 1/2″ or 12mm inch hex
at the top which can allow you to extend the tooling with a socket further if need.
Inserts not included order separately.
INSTRUCTIONS

Tooling length inches: