The kit is intended for the restoration of internal threads.
Restoration is done by screwing in the spring insert.
The set includes a drill, a tap, a handle for installing threaded inserts, a tool for breaking the tip of the insert attachment and 12 inserts.
Inserts are made of stainless steel.
The internal thread size is the same. The height is equal to the diameter of the internal thread, one and a half diameters, and two diameters of the internal thread.