Ideal for restoring damaged threads, suitable for engine repair and other automotive applications. Designed for use with steel, cast iron, and aluminum. Suitable for daily repair, car repair, drilling machines, and similar uses. Made of high-quality material for durability and long-lasting performance. Wrench: surface electrophoresis Thread specifications: M3x0.5mm, M4x0.7mm, M5x0.8mm, M6x1.0mm, M7x1.0mm, M8x1.25mm Instructions for use: 1. Drill out the damaged thread using the correctly sized drill bit (included). 2. Tap the re-drilled hole using the included tap. 3. Load the coiled insert into the applicator. 4. Screw the coil into the casting. 5. Use the breaking tool to remove the tag on the insert. 6. The thread is now repaired and ready for use. Perfect for engine repair and automotive applications requiring thread restoration. Note: Due to variations in manufacturing batches, product markings may vary. Accessories may have slight differences in color and appearance, but this does not affect functionality. Color: As shown in photo Material: High-speed steel Package contents: 1 set x M7x1 thread repair tool Note: Other items not included. Lighting and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.