Ideal for restoring damaged threads, suitable for engine repair and other automotive applications. Suitable for use with steel, cast iron, and aluminum. Can be used in daily repair, car repair, drilling machines, and similar applications. Made of high-quality material, sturdy and durable. Wrench: surface electrophoresis treatment Thread specifications: M3x0.5mm, M4x0.7mm, M5x0.8mm, M6x1.0mm, M7x1.0mm, M8x1.25mm How to use: 1. Drill out damaged thread using the correctly sized drill bit (supplied). 2. Tap the re-drilled hole using the tap supplied. 3. Load coiled insert into applicator. 4. Screw coil into casting. 5. Using the lug breaking tool, break off the tag on insert. 6. Thread is repaired and ready to use. Due to different production batches, product markings may vary slightly in color and appearance; however, this does not affect normal use. Color: As shown in photo Material: High Speed Steel Package Contents: 1 set x M7x1 repair tool Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.