K-M14 (14mm x 2.0) Metric Permanent Repair Thread Inserts with drill bits are suitable for almost all repairs of OEM threaded holes. Also, they are thick enough to replace failed Heli-Coils, Keenserts, E-Z Locks, Hole Savers, and other brands. The C-Sert is a fail-proof thread repair insert that is self-tapping, self-guiding, and made of S7 high-impact steel. C-Sert threads are considered heavy duty that prevents pull-our and back-out and consist of internal die threads grip that prevents strip-out.