1. METRIC SAE Thread Repair Kit:Helicoil kit has Altogether 263 Pieces including drill bits, screw taps, wire thread inserts,installation tang breakoff tools, and two thread gauges allow you to have a smooth repairing experience. All Made According to Professional Standard.Designed to address the most critical needs, it embraces both SAE and METRIC sizes: 1/4', 5/16', 3/8', 7/16', and 1/2', along with M5, M6, M8, M10, and M12. 2. Steel:Crafted from highquality steel with a titanium coating for maximum durability, our thread restorer kit boasts exceptional hardness and impact resistance, guaranteeing longlasting performance. Helicoil thread repair kit is heat treated, endowing them with superior strength and an extended lifecycle, ensuring they perform with precision over the long haul. 3. Versatile Usage:Rethreading kit is suitable for a wide range of materials. It includes aluminum, iron, carbon steel, bronze and magnesium, making it ideal for automotive and plumbing applications. 4. :The combination of a 135° drill bit and a breakoff tool can achieve thread repair to professional standards. It not only repairs but also resists wear and tear. Allows you to quickly and efficiently drill, tap, insert coils and break off cuts to repair threads. It is also a preventive maintenance tool to protect thread integrity. In addition, the insertion tool with rubbercoated handle ensures a comfortable and reliable grip while working.