A threaded insert, coarse thread screw insert as a fastener element. 1.repair a stripped threaded hole, 2.provide a durable threaded hole in a soft material. 3. eliminating a machining operation Installation process: Drilling→Tapping→Installing→Breaking off tang Tools: 1.Drill: used for drilling the base holes 2. taps: used for the processing special internal thread of the base holes. 3.Installation tools: put sets into the threaded hole. 4.Break-off tools: break off the tang of thread insert. 5.Extraction tools: used for removing the damaged thread insert from the threaded hole.