Screw thread sleeve made of high quality stainless steel wire, cross-section is diamond-shaped, and mechanically rolled into a spring-shaped thread. The diameter of the sheath is larger than the screw hole, when installed, the screw threaded sleeve is compressed and tightened, and after the installation is completed, it springs back to its original shape, so that the screw threaded sleeve is permanently fixed in the screw hole. Because of its larger diameter, the threaded sleeve has a larger contact surface and is therefore stronger than the original thread.