1.It is a high-end threaded fastener.2.It is made of high-strength, high-precision and corrosion-resistant stainless steel raw wire which is rolled into a diamond shape and then rolling.3.It is shaped like a spring and is installed in a specific threaded hole of the body.4.Its inner surface forms a standard thread, when it is matched with a screw(bolt),the threaded ioint strength and wear resistance can be significantly improved.5.Especially in low-strength materials such as Aluminum, Magnesium,···