A threaded insert, also known as a threaded bushing, is a fastener element that is inserted into an object to add a threaded hole. They may be used to repair a stripped threaded hole, provide a durable threaded hole in a soft material. A helical insert is an insert made of coiled wire. Another common generic name is screw thread insert (STI), although many users persist in calling them all by prominent brand names. Available in screw lock series, special material like nickel, titanium, incone etc... Do CONTACT US for special material options.Usually ships in 24-48hours.