Damaged threads in cylinders or engines can be a major problems, which is why a thread repair kits such as this one from Motoforce is an invaluable addition to your toolbox.
Included in the set are a drill bit to drill out the original thread, a tap to re-tap an oversize thread, and an installing tool for the inserts which bring it back to the original thread size as well as 20 thread inserts.
The set is packaged neatly in a plastic box.

These sets are high quality premium kits manufactured in Germany, and are NOT budget Chinese kits!

Motoforce MF99.20164