LeaderSert 10526 1/4-24 Nf SAE self-tapping and self-aligning thread repair insert kit with inserts and leaders only, for the repairing of stripped threads.
NES - The Thread Repair Experts

Nes thread repair tools are a complete line of tools specially designed to repair any defective thread, both internal and external. Our patented tools are universal in diameter and Pitch to give the user a comfortable, easy to use, fast and cost effective solution for any case of defective thread —in this we're the experts!