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, and drilling machines. 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 How to use: 1. Drill out damaged thread using correctly sized drill bit (supplied). 2. Tap re-drilled hole using tap supplied. 3. Load coiled insert into applicator. 4. Screw coil into casting. 5. Using lug breaking tool, break off tag on insert. 6. Thread is repaired and ready to use. Due to different factory batches, product markings may vary, and accessories may have slight differences in color and appearance, but this does not affect normal use. Color: As shown in photo Material: High Speed Steel Package Contents: 1 set * M7x1 repair tool Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual item. Measurement may vary by +/- 1-3 cm.