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 applications. Made of high-quality material for sturdy and durable performance. Wrench: surface electrophoresis Thread specifications: M3x0.5mm, M4x0.7mm, M5x0.8mm, M6x1.0mm, M7x1.0mm, M8x1.25mm Instructions: 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 lug breaking tool to break off the tag on the insert. 6. The thread is repaired and ready for use. Suitable for engine repair and other automotive applications requiring thread restoration. Note: Due to different production batches, product markings may vary slightly. Accessories may have minor 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 repair tool (Other items not included) Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.