Helical Insert Repair Kit, Helical Inserts, M4-0.70, Plain 18-8 Stainless Steel, Chrislynn Corp, Mfr#: 83155

the precision insert system was devised as a simple method of repairing stripped or damaged threats in any metal or valuable part. Inserts are also used in new products, such as die castings or plastics, where excessive stress on threads could cause damage or failure.