Feature:1. Repair threaded holes costeffectively, features M4x0.7 internal thread and M8x1.25 external thread.2. Made of highquality 303 stainless steel, high hardness, corrosionresistant and durable.3. Suitable for aviation, automobiles, electronic communications, lamps, machinery and radiators, etc.4. Ergonomic design, timesaving and laborsaving, reduces the difficulty of work.5. Strictly follow the manufacturing standard to make sure excellent performance.Specification:Item Type: Thread Insert Kit Material: 303 Stainless SteelSpecification:Female Thread: M4 x 0.7Male Thread: M8 x 1.25Length: Approx. 8mm/0.3inSlotting: YesPurpose: Thread RepairCase: For example, if the M8 thread is slippery, if you want to continue to use the M8 thread after the restoration, use this method to first expand the M8 thread to the M10 thread, and then use the M8-M10-12 length reducer to change it back to M8 , So because the material of this reducing diameter is stainless steel, it will make the M8 thread more firm.Package List:10 x Thread Inserts