1120 Pcs Set: The set contains 120 pieces thread inserts, with the specifications of M3 M4 M5 M6 M8 M10 M12, could meet your different needs. 2Good Characteristics: These inserts are sturdy, not easy to scratch, the threads are deep, uniform in force, no burr, clear and neat. 3Powerful Function: The insert nuts have continuous high strength, high precise, strong shock, impact and wear resistance, can disperse body pressure, protect thread, extend the service life. 4Stainless Steel Material: Made of premium stainless steel, resistant to corrosion and rust, has good toughness, high hardness. 5Widely Used: For door and window industry, computer maintenance and assembly, automobile manufacturing and production, electrical appliances and air conditioners, etc.