Features: 1.Manufactured from chrome vanadium steel for high strength and long durability. 2.Perfect for restoring damaged threads in steel, cast, iron and aluminum, simple to operate. 3.Suitable for engine repair and other automotive applications, wide range of application. 4.110pcs wire thread inserts: M5 x 0.8, M6 x 1.0, M8 x 1.25, M10 x 1.5, M12 x 1.75. 5.Comes with a tool box, which can keep all the tools organized and easy to transport. Specification: Condition: 100% Brand New_x000D_ Item Type: Thread Repair Tool _x000D_ Material: Steel_x000D_ Set Includes the Following:_x000D_ 5 x installation tools _x000D_ 5 x break pin tools _x000D_ 5 x twist drills _x000D_ 1 x hex key _x000D_ 5 x taps_x000D_ _x000D_ 110pcs wire thread inserts_x000D_ M5 x 0.8_x000D_ M6 x 1.0_x000D_ M8 x 1.25_x000D_ M10 x 1.5_x000D_ M12 x 1.75_x000D_ _x000D_ Application:_x000D_ 1. Drilling - clear the damaged threads with a standard drill. (to repair a spark plug thread no pre-drilling is necessary if using the special spark plug tap), please pay attention that for fluteless taps bigger holes are required._x000D_ 2. Check - check that the thread and pitch of the tap and the bolt match._x000D_ 3. Tapping - use the special taps for cutting the holding thread into the cleared hole (recommended to use a suitable cutting oil)_x000D_ 4. Install the insert - place insert on installation tool and position the adjustable ring so that the insert tang is centered in the tang slot. Wind the insert in with a light downward pressure until a half turn below the surface._x000D_ 5. Don't work against the thread direction as the tang could break._x000D_ 6. Tang removal - After finishing lift the installation tool and use the tang break tool to remove the tang. For bigger sizes and spark plug taps use long nose pliers to remove the tang. Due to the narrow and exact tolerances the new thread normally is stronger than the original ones.