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, and drilling equipment. Made of high-quality material, sturdy and durable. Wrench: Surface electrophoresis. Thread specifications: M3x0.5mm, M4x0.7mm, M5x0.8mm, M6x1.0mm, M7x1.0mm, M8x1.25mm. Instructions: 1. Drill out 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: Product labeling and accessory colors may vary slightly between manufacturing batches, 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.